Vision

“

▶️ Oh, nice view!

— Monkey King

”

Vision describes what a unit can and cannot see within a circular area from its current location and state. Places a unit cannot see are filled with the Fog of War, a dark mist that hides enemy units inside of it. Allied units cannot be hidden by the fog of war. Invisible units cannot be seen even when outside of the Fog of War, unless they are revealed by a source of True Sight. Trees and higher elevation block a unit's vision if it has ground vision. Flying vision is unobstructed by trees and elevation. Abilities can grant vision over areas as well, usually for a short amount of time and limited to their area of effect.

All vision is shared within a team, which means that everything allied units see can be seen by the player as well. This includes allied player-controlled units, as well as NPC units, like lane creeps and buildings.

Fog of War[]

All areas outside of friendly vision are constantly covered by the Fog of War. Any non-friendly units within the Fog of War cannot be seen or directly targeted, however they can still be hit by non-targeted spells. To unveil units in the Fog of War, an allied unit must gain vision over that area.

If an enemy enters the fog of war during the cast time of an ability, the cast gets canceled. However, attacks do not cancel if their targets enter the fog of war during the attack animation.

Elevation[]

Main Article: Terrain

The Dota 2 map's cliffs and valleys shape the battle, determining both where units can move and what they can see. Units with ground vision cannot see areas that are on higher elevation than them. For example, a unit standing in the river (which is the on the lowest elevation) cannot see anything past the cliffs surrounding the river, or beyond the ramps leading out of the river.

On the other side, units standing on higher elevation effectively have unobstructed vision on lower elevation. For example, a unit standing on an elevated ward spot can see the entire surrounding, unobstructed by nearby trees, regardless of their vision type.

Units with flying vision do not have their vision obstructed by higher elevations.

Trees[]

Main Article: Trees

Amount of vision blocked by single tree changes based on proximity to it.

Besides blocking pathing, trees also block vision for units on the same elevation as them, and for units one elevation above them. Trees block vision like how objects cast shadows: The closer the object is to the source of light, the bigger and wider the object's shadow gets. The closer a unit is to a tree, the more vision is blocked by the tree, blocking out an entire section of the circular vision area of the unit. The exact numbers for these are unknown.

The small trees created by Iron Branch, Ironwood Tree, Woodland Striders, and Sprout have a narrower vision blocker than the regular trees on the map.

Units with flying vision do not have their vision obstructed by trees.

Vision Blockers[]

Main Articles: Fountain and Roshan

Artificial vision blockers exist at certain locations, which control visibility additionally to the normal rules. All sources of flying vision are unaffected by vision blockers.

Fountain Entrances[]

Both fountains have a vision blocker at their stairs, preventing the enemies of that fountain's team from seeing into the fountain area from outside. This is normally redundant, since the fountain's higher elevation already prevents vision, but it also prevents vision from nearby higher-elevation ground, such as the Radiant fountain ward cliff.

Roshan Pit[]

Green tiles can see in, but cannot be seen from inside. Red tiles can see out, but cannot be seen from outside.

Roshan's pit is sealed by vision blockers that prevent vision both into and out of the pit.

However, the pit entrance also has phantom spots, areas in which vision is asymmetric. Units standing in these areas can either see into the pit while being unseen from inside, or see out of the pit while being unseen from outside. These may be useful for juking, scouting Roshan attempts, and for hiding wards, most notably Remote Mines. With ground vision, units on phantom spots can only be seen by standing within 3 tiles of them (in rectilinear distance).

In-game, the phantom spots are not marked. To tell when you've stepped into a phantom spot, look for a subtle brightning of a small area of ground around you. This indicates you have direct vision of some phantom spot tiles, implying you are in a phantom spot yourself. The right side of the pit entrance has the largest continuous phantom spot, so it is the most forgiving location for this.

Time of day[]

The current time of day affects vision. Most units' vision range is shorter at night and higher by day. Exceptions exist, with some units having shorter day vision and longer night vision, and some having the same vision regardless of time.

Base Vision Ranges[]

Most units have day and night vision, only very few have absolutely no vision. These values can be altered with vision bonuses and reductions.

Heroes[]

All heroes have a vision range of 1800 during the day and 800 during the night, except for the following ones:

Unit	Day	Night
Bane	1800	1200
Batrider	1600	800
Bounty Hunter	1800	1000
Night Stalker	800	1800
Slark	1800	1800
Sniper	1800	1400

Lane Creeps[]

All lane creeps have a vision range of 750 during the day and the night, except for the following ones:

Unit	Day	Night
Lycan Lane Wolf	1200	800

Neutral Creeps[]

All neutral creeps have a vision range of 800 during the day and the night, except for the following ones:

Unit	Day	Night
Ancient Ice Shaman	1400	800
Ancient Rumblehide	1400	800
Ancient Thunderhide	1400	800
Harpy Scout	1200	800
Harpy Stormcrafter	1800	1800
Hill Troll Priest	1400	800
Kobold	1400	800
Roshan	1400	1400
Skeleton Warrior	800	600
Vhoul Assassin	400	400

Roshan[]

Unit	Day	Night
Roshan	1400	1400

Summoned Creeps[]

Unit	Day	Night
Boar	1400	800
Eidolon	1200	800
Forged Spirit	1200	800
Greater Treant	500	500
Hawk	750/800/850/900	750/800/850/900
Lycan Wolf	1200	800
Necronomicon Archer	1300/1400/1500	800
Necronomicon Warrior	1300/1400/1500	800
Skeleton Warrior	800	600
Spiderite	700	700
Spiderling	700	700
Treant	500	500
Undying Zombie	1400	1400
Wraith King Skeleton	800	600

Creep-Heroes[]

Unit	Day	Night
Astral Spirit	350	350
Earth	1800	800
Familiar	400	400
Fire	1800	800
Spirit Bear	1400	800
Storm	1800	800
Void	1800	800
Warlock Golem	1800	1800

Clones[]

Unit	Day	Night
Tempest Double	1800	800

Couriers[]

Unit	Day	Night
Courier	200	200

Wards[]

Unit	Day	Night
Death Ward	1200	800
Fiend's Gate	500	500
Healing Ward	600	600
Homing Missile	400	400
Ice Spire	800	800
Ignis Fatuus	1800	800
Jex	600	600
Nether Ward	600	600
Nimbus	500	500
Observer Ward	1400	1400
Phoenix Sun	1800	800
Plague Ward	800	800
Power Cog	1600	600
Proximity Mine	64	64
Psionic Trap	400	400
Remote Mine	700	700
Sentry Ward	0	0
Serpent Ward	1200	800
Skeleton Archer	800	800
Tombstone	1800	1800
Tornado	300	300
Wraith Pact Totem	600	600

Miscellaneous[]

Unit	Day	Night
Beetle	321	321
Phantom	200	200
Spin Web	0	0

Buildings[]

Building	Day	Night	True Sight	Attack Range
Ancient (Building)	2600	2600	900
Effigy Building	900	600	0
Fountain	1800	1800	1200	1200
Melee Barracks	900	600	0
Outpost	500	500	0
Ranged Barracks	900	600	0
Tower (Tier 1)	1900	600	700	700
Tower (Tier 2)	1900	1100	700	700
Tower (Tier 3)	1900	1100	700	700
Tower (Tier 4)	1900	1100	700	700

Types of Vision[]

There are 2 types of vision, ground vision (also known as obstructed vision) and flying vision (also known as unobstructed vision). Ground vision is impaired by higher elevations, trees, and vision blockers, while flying vision is completely unhindered.

Every hero has ground vision. Other units have the following vision types

Units	Vision type
Beetle, Familiar, Hawk, Tornado	Flying
Alpha Wolf, Ancient, Ancient Black Dragon, Ancient Black Drake, Ancient Frostbitten Golem, Ancient Granite Golem, Ancient Ice Shaman, Ancient Rock Golem, Ancient Rumblehide, Ancient Thunderhide, Astral Spirit, Boar, Centaur Conqueror, Centaur Courser, Courier, Dark Troll Summoner, Death Ward, Earth, Effigy Building, Eidolon, Fell Spirit, Fiend's Gate, Fire, Forged Spirit, Fountain, Ghost, Giant Wolf, Greater Treant, Harpy Scout, Harpy Stormcrafter, Healing Ward, Hellbear, Hellbear Smasher, Hill Troll, Hill Troll Berserker, Hill Troll Priest, Homing Missile, Ice Spire, Ignis Fatuus, Jex, Kobold, Kobold Foreman, Kobold Soldier, Lycan Lane Wolf, Lycan Wolf, Mega Melee Creep, Mega Ranged Creep, Melee Barracks, Melee Creep, Mud Golem, Necronomicon Archer, Necronomicon Warrior, Nether Ward, Nimbus, Observer Ward, Ogre Bruiser, Ogre Frostmage, Outpost, Phantom, Phoenix Sun, Plague Ward, Power Cog, Proximity Mine, Psionic Trap, Ranged Barracks, Ranged Creep, Remote Mine, Roshan, Satyr Banisher, Satyr Mindstealer, Satyr Tormenter, Sentry Ward, Serpent Ward, Shard Golem, Siege Creep, Skeleton Archer, Skeleton Warrior, Spiderite, Spiderling, Spin Web, Spirit Bear, Storm, Super Melee Creep, Super Ranged Creep, Super Siege Creep, Tempest Double, Tombstone, Tower (Tier 1), Tower (Tier 2), Tower (Tier 3), Tower (Tier 4), Treant, Undying Zombie, Vhoul Assassin, Void, Warlock Golem, Warpine Raider, Wildwing, Wildwing Ripper, Wraith King Skeleton, Wraith Pact Totem	Ground

Modifying vision[]

Several abilites and items have abilities that grant or reduce vision.

Vision increasing abilities[]

Vision increasing abilities and items

Lycan - Shapeshift

Night vision bonus: Global
Duration: 25 ( 31)
Affects the caster, or the Wolf Bite target.
Luna - Lunar Blessing

Night vision bonus: 250/500/750/1000
Passive.
Batrider - Firefly

Vision bonus: 100/200/300/400
Duration: 15 ( 21.5)
Affects the caster.
Book of Shadows

Night Vision Bonus: 400
Winter Wyvern - Arctic Burn

Night vision bonus: 400
Duration: 10 ( Indefinite)
Affects the caster.
Moon Shard - Consume

Night vision bonus: 200
Duration: Permanent
Affects the target ally. Multiple instances do not stack. Takes priority over all other vision change effects. Does not stack with Shade Sight.
Moon Shard - Shade Sight

Night vision bonus: 400
Passive. Takes priority over all other vision change effects. Does not stack with Consume.
Seer Stone

Vision Bonus: 350

Vision reducing abilities[]

Vision reducing abilities

Bane - Nightmare

Duration: 4/5/6/7
Affects the target unit. Sets their vision to 100. Takes priority over all other vision changing effects, except for Shade Sight.

Vision setting abilities[]

These abilities set a unit's vision to a specific value.

Vision setting abilities

Bane - Nightmare

Duration: 4/5/6/7
Affects the target unit. Sets their vision to 100. Takes priority over all other vision changing effects, except for Shade Sight.
Monkey King - Tree Dance

Day vision: 700 ( 1050)
Night vision: 500 ( 750)
Affects the caster. Lasts until unperched. Takes priority over all other vision changing effects, except for Shade Sight and Consume.

Talents[]

The following heroes have a talent that grants them bonus vision.

Bonus	Level 10		Level 15		Level 20		Level 25
Bonus	Left	Right	Left	Right	Left	Right	Left	Right
Night Vision		+500

Sources of Vision[]

Units are not the only entities with vision. A lot of abilities are able to create vision cells of varying sizes on the world, revealing an area of a fixed duration.

Caster Vision[]

Caster vision is a vision cell granted to the victims of targeted spells and attacks. Whenever a unit casts a spell (except Charge of Darkness) on an enemy within 1800 range, or performs an attack on them, the enemy gains 150 radius ground vision around the casting or attacking unit which lasts for 2 seconds. This vision prevents players from easily and constantly harassing enemies from the fog of war, especially with long-distant spells that can be spammed easily like Arcane Bolt, or with ranged attacks.

Only one of these vision cell can exist per unit. This means if a vision cell already exists from a previous targeted order, performing another targeted order within the previous vision cell's duration does not create a second vision cell. Instead, the location of the previous vision cell gets updated, its duration gets reset, and its vision type is changed to flying vision.

Caster vision is also applied upon launching an attack. The result of the attack does not matter, if the attack is executed, the vision is granted.

Ground Vision[]

Ground vision is obstructed by trees, higher elevations, and vision blockers.

Sources of ground vision

Aegis of the Immortal - Reincarnation

Day vision radius: 1800
Night vision radius: 800
Provides ground vision around the hero upon triggering. Lingers for 5 seconds.
Ancient Black Dragon - Fireball

Vision radius: 300
Provides ground vision within the target area. Lingers for 10 seconds.
Arc Warden - Spark Wraith

Vision radius: 300
Provides ground vision around the wraith while stationary, starting upon cast. Lingers for 47 seconds. Triggering the wraith removes the vision.
Bane - Fiend's Grip

Vision radius: 400
Provides ground vision within the area of target unit's initial position. Duration is based on the channel time after reductions and amplifications. Always lingers for the full duration, even when canceled.
Bloodseeker - Blood Rite

Vision radius: 600
Provides ground vision within the area. Lingers for 5 seconds.
Clockwerk - Hookshot

Vision radius: 200
Provides non-lingering ground vision around the hook's tip as it travels and upon retracting. Provides 400 radius vision at the max distance upon reaching it, if not latching.
Crystal Maiden - Crystal Nova

Vision radius: 900
Provides ground vision at the target area. Lingers for 6 seconds.
Disruptor - Kinetic Field

Vision radius: 350
Provides ground radius within the target area. Lingers for 5 seconds.
Elder Titan - Astral Spirit

Vision radius: 400
Provides non-lingering ground vision around the spirit, until it returns or dies.
Enigma - Black Hole

Vision radius: 800
Provides ground vision at the target area. Lingers for 4 seconds.
Kunkka - Torrent

Vision radius: 400
Provides ground vision at the target area. Lingers for 3.1 seconds.
Kunkka - X Marks the Spot

Vision radius: 400
Provides ground vision around the x mark on the ground. Lingers for 5.94 seconds.
Luna - Eclipse

Vision radius: 6/9/12
Provides ground vision within the target area when cast on the ground. Lingers for 2.4/4.2/6 seconds.
Manta Style - Mirror Image

Vision radius: 1000
Provides ground vision around the caster upon cast. Lingers for 0.1 seconds.
Monkey King - Primal Spring

Vision radius: 375
Provides ground vision within the target area. The duration is based on the channel time, plus the travel time based on the distance. Always lingers for the full duration, even when canceled.
Phantom Lancer - Doppelganger

Vision radius: 900
Provides ground vision within the illusion gather area. Lingers for 1 second.
Phoenix - Launch Fire Spirit

Vision radius: 4
Provides ground vision within the affected area on impact. Lingers for 1 second.
Riki - Tricks of the Trade

Vision radius: 450
Provides ground vision within the attack radius. Duration is based on the channel time. Always lingers for the full duration, even when canceled.
Spectre - Spectral Dagger

Vision radius: 200
Provides ground vision around the shadow trail left by the dagger, and by hit enemy heroes. Lingers for 12 seconds.
Techies - Proximity Mines

Vision radius: 400
Provides ground vision around itself upon exploding. Lingers for 1 second.
Tidehunter - Gush

Vision radius: 0 ( 200)
Requires Aghanim's Scepter. Provides ground vision at each hit enemy's location. Lingers for 2 seconds.
Timbersaw - Timber Chain

Vision radius: 100
Provides non-lingering ground vision around the hook's tip as it travels.
Undying - Reincarnation

Vision radius: 1800
Provides ground vision around the hero upon triggering. Lingers for 5 seconds.
Wraith King - Reincarnation

Day vision radius: 1800
Night vision radius: 800
Provides ground vision around the hero upon triggering. Lingers for 3 seconds.

Flying Vision[]

Flying vision is not obstructed by trees, higher elevations, and vision blockers.

Sources of flying vision

Ancient Apparition - Ice Vortex

Vision radius: 200
Provides flying vision at the target area. Lingers for 16 seconds.
Ancient Apparition - Ice Blast

Vision radius: 500
Provides flying vision around both projectiles as they travel. The vision of the tracer does not linger. The vision of the ice ball lingers for 3.5 seconds.
Ancient Apparition - Release

Vision radius: 750
Provides flying vision at the marked area upon cast. Lingers for 5.3 seconds.
Arc Warden - Spark Wraith

Vision radius: 300
Provides non-lingering flying vision around the wraith as it travels towards the target. Provides the same vision around the target's location upon impact. Lingers for 3.34 seconds.
Batrider - Sticky Napalm

Vision radius: 500
Provides flying vision at the targeted area. Lingers for 2 seconds.
Batrider - Flamebreak

Vision radius: 300
Provides non-lingering flying vision around the explosive cocktail as it travels.
Beastmaster - Wild Axes

Vision radius: 350
Provides non-lingering flying vision around the axes as they travel.
Chaos Knight - Phantasm

Vision radius: 400
Provides flying vision around the caster upon cast. Lingers for 0.5 seconds.
Clockwerk - Rocket Flare

Vision radius: 600
Provides flying vision around the rocket as it travels. Lingers for 10 seconds.
Disruptor - Thunder Strike

Vision radius: 450
Provides flying vision around the target's location upon applying the final strike. Lingers for 3 seconds.
Disruptor - Glimpse

Vision radius: 400
Provides non-lingering flying vision around the projectile as it travels. Provides the same vision around the target's location after getting teleported back. Lingers for 3.34 seconds.
Disruptor - Static Storm

Vision radius: 450
Provides flying vision at the target area. Lingers for 5 ( ) seconds.
Drow Ranger - Multishot

Vision radius: 100
Provides non-lingering flying vision around the arrows as they travel.
Elder Titan - Earth Splitter

Vision radius: 500
Spawns 12 vision cells along the crack in 0.22-second intervals, with a distance of 200 in between each, which provide vision around where they are spawned. Lingers for 4 seconds.
Faceless Void - Chronosphere

Vision radius: 475
Provides flying vision at the target area. Lasts 4/4.5/5 seconds.
Grimstroke - Stroke of Fate

Vision radius: 160
Provides non-lingering flying vision around the ink trail as it travels. Provides the same vision at the max distance upon reaching it. Lingers for 2 seconds.
Gyrocopter - Homing Missile

Vision radius: 400
Provides non-lingering flying vision around the missile as it travels. Provides the same vision at the target's location on impact. Lingers for 4 seconds.
Gyrocopter - Call Down

Vision radius: 350
Provides flying vision at the target area upon cast. Lingers for 4 seconds.
Invoker - Tornado

Vision radius: 200
Provides non-lingering flying vision around the tornado as it travels. Provides the same vision at the max distance upon reaching it. Lingers for 1.75 seconds.
Invoker - Sun Strike

Vision radius: 400
Provides flying vision at the target area upon cast. Lingers for 5.7 seconds.
Invoker - Chaos Meteor

Vision radius: 500
Provides non-lingering flying vision around the meteor as it starts rolling. Provides the same vision at the max distance upon reaching it. Lingers for 3 seconds.
Io - Spirits

Vision radius: 350
Provides flying vision around the hit enemy hero upon impact. Lingers for 3 seconds.
Io - Relocate

Vision radius: 150
Provides flying vision at the targeted point upon cast. Lingers for 2.7 seconds.
Jakiro - Ice Path

Vision radius: 150
Provides flying vision along the entire path. Lingers for 3 seconds.
Juggernaut - Omnislash

Vision radius: 300
Provides flying vision around the caster on each slash. Lingers for 1 second.
Keeper of the Light - Illuminate

Vision radius: 375
Spawns vision cells in front of the caster in a line in 0.5-second intervals, with a distance of 150 in between each, which provide vision around where they are spawned. Spawns them until the channeling ends. Lingers for 10.34 seconds.
Kunkka - Ghostship

Vision radius: 400
Provides non-lingering flying vision around the ships as they travel.
Lich - Chain Frost

Vision radius: 800
Provides non-lingering flying vision around the ball of ice as it travels. Stops after the 60th bounce.
Mars - Spear of Mars

Vision radius: 300
Provides non-lingering flying vision around the spear as it travels. Provides the same vision upon reaching max distance, or upon impaling an enemy. Lingers for 1 second if not impaled. If impaled, lingers for 1 ( ) seconds.
Mars - Arena Of Blood

Vision radius: 550
Provides flying vision within the target area upon cast. Lasts 0.8 seconds.
Medusa - Mystic Snake

Vision radius: 300
Provides non-lingering flying vision around the snake as it travels.
Meepo - Earthbind

Vision radius: 300
Provides non-lingering flying vision around the net as it travels.
Mirana - Sacred Arrow

Vision radius: 500
Provides non-lingering flying vision around the arrow as it travels. Provides the same vision upon reaching max distance, or upon hitting an enemy. Lingers for 3.5 seconds.
Naga Siren - Mirror Image

Vision radius: 450
Provides flying vision around the caster upon cast. Lingers for 0.3 seconds.
Nature's Prophet - Sprout

Vision radius: 500
Provides flying vision at the target area upon cast. Lingers for 3/4/5/6 seconds.
Night Stalker - Dark Ascension

Vision radius: 1800
Provides flying vision around the hero. Is active for for 30 seconds.
Oracle - Fortune's End

Vision radius: 200
Provides non-lingering flying vision around the orb as it travels. Provides the same vision at the target's location on impact. Lingers for 2 seconds.
Phantom Assassin - Stifling Dagger

Vision radius: 450
Provides non-lingering flying vision around the dagger as it travels. Provides the same vision at the target's location on impact. Lingers for 3.34 seconds.
Puck - Illusory Orb

Vision radius: 450
Provides flying vision around the orb as it travels. Lingers for 3.34 ( 3.3734) seconds.
Pudge - Meat Hook

Vision radius: 400
Provides flying vision around the unit the hook latches on upon latching. Lingers for 4 seconds.
Razor - Plasma Field

Vision radius: 800
Provides flying vision around the caster for the entire duration. Lingers for 2 seconds.
Shadow Demon - Shadow Poison

Path vision radius: 350
Hit/End vision radius: 300
Provides non-lingering flying vision around the poison cloud as it travels. Provides flying vision around each hit enemy, and at max distance upon reaching it. Lingers for 3.5 seconds.
Skywrath Mage - Arcane Bolt

Vision radius: 325
Provides non-lingering flying vision around the bolt as it travels. Provides the same vision at the target's location on impact. Lingers for 3.34 seconds.
Skywrath Mage - Concussive Shot

Vision radius: 300
Provides non-lingering flying vision around the shot as it travels. Provides the same vision at the target's location on impact. Lingers for 3.34 seconds.
Snapfire - Mortimer Kisses

Vision radius: 500
Provides non-lingering flying vision around the lava blobs as they travel. Provides the same vision at marked location on impact. Lingers for 3.5 seconds.
Sniper - Shrapnel

Vision radius: 450
Provides flying vision within the target area after the effect delay. Lingers for 0.5 seconds.
Storm Spirit - Ball Lightning

Vision radius: 400
Provides non-lingering flying vision around the ball of lightning as it travels.
Sven - Storm Hammer

Vision radius: 225
Provides non-lingering flying vision around the fist as it travels.
Techies - [[Techies#|]]
64px|text-top|link=Techies#
Vision radius: 600
Provides flying vision around itself upon detonating. Lingers for 1 second.
Techies - [[Techies#|]]
64px|text-top|link=Techies#
Vision radius: 500
Provides flying vision around itself upon exploding. Lingers for 3 seconds.
Timbersaw - Chakram

Vision radius: 200
Provides flying vision around the sawblade after reaching the targeted location, until it starts to return.
Timbersaw - Second Chakram

Vision radius: 200
Provides flying vision around the sawblade after reaching the targeted location, until it starts to return.
Tiny - Tree Throw

Vision radius: 100
Provides non-lingering flying vision around the tree as it travels, if ground-targeted. No provided if unit-targeted. Provides the same vision at the target's location on impact, regardless of how it was targeted. Lingers for 2 seconds.
Tiny - Tree Volley

Tree vision radius: 400
Impact vision radius: 100
Provides non-lingering flying vision around the trees as they travel. Provides flying vision at each hit enemy's location on impact. Lingers for 2 seconds.
Tusk - Ice Shards

Projectile vision radius: 200
Shards vision radius: 100
Provides non-lingering flying vision around the projectile as it travels. Provides flying vision around each shard after their creation. Lingers for 2 seconds.
Vengeful Spirit - Wave of Terror

Vision radius: 300
Provides flying vision around the wave as it travels. Lingers for 4 seconds.
Venomancer - Venomous Gale

Vision radius: 350
Provides non-lingering flying vision around the gale as it travels.
Void Spirit - Aether Remnant

Travel vision radius: 150
Stationary vision radius: 200
Provides non-lingering flying vision around the remnant as it travels. Spawns 2 vision cells in front of the remnant after the delay, one at max distance, and the other halfway through max distance. Lingers for as long as the remnant exists, so if triggered, the vision stops once the pulling ends.
Weaver - The Swarm

Vision radius: 100
Provides non-lingering flying vision around each individual beetle within the swarm as they travel.
Windranger - Powershot

Vision radius: 400
Provides non-lingering flying vision around the arrow as it travels. Provides the same vision at the max distance upon reaching it. Lingers for 3.34 seconds.
Zeus - Lightning Bolt

Vision radius: 750
Provides flying vision around the target point or targeted enemy. Lingers for 4.5 seconds.
Zeus - Thundergod's Wrath

Vision radius: 500
Provides flying vision around each hit enemy hero. Lingers for 3 seconds.
Sentry Ward - Plant

Vision radius: 150
Provides flying vision around the ward upon cast. Lingers for 12 seconds.
Town Portal Scroll - Teleport

Vision radius: 200
Provides flying vision at the teleport destination upon channel begin. Duration is based on the channel time. Always lingers for the full duration, even when canceled.
Gem of True Sight

Vision radius: 300
Provides non-lingering flying vision around the gem whenever it is on the ground, for the team that dropped it the last.
Meteor Hammer - Meteor Hammer

Vision radius: 2.5
Provides flying vision within the target area upon cast. Lingers for 3 seconds.
Shiva's Guard - Arctic Blast

Vision radius: 800
Provides flying vision around the caster for the entire duration. Lingers for 2 seconds.

Shared Vision[]

Some abilities are capable of sharing an enemy unit's vision the player's team. This means anything that unit sees can also be seen by its opponents.

Sources of shared vision

Disruptor - Thunder Strike

Duration: 6
Shares the target's vision for the duration.
Grimstroke - Phantom's Embrace

Duration: 5
Shares the target's vision upon latching on it.
Grimstroke - Soulbind

Duration: 6/7/8
Shares the target's vision, as well as the vision of the secondary target it binds to.
Meepo - Earthbind

Duration: 2
Shares all rooted enemies' vision.
Razor - Static Link

Duration: 5/6/7/8
Shares the target's vision while draining them.
Silencer - Last Word

Duration: 3/4/5/6
Shares the targets' vision during the initial debuff's duration.
Sniper - Assassinate

Duration: 0.01
Shares the target's vision upon cast begin. Vision is removed prematurely on projectile impact.
Spectre - Spectral Dagger

Duration: 7
Shares all hit enemy heroes' vision as long as they create a shadow path still.
Spirit Breaker - Charge of Darkness

Shares the target's vision until the charge stops, either upon reaching it, or when canceled earlier.

Exposing[]

Several abilities are capable of exposing an enemy's model through the fog of war, without truly providing vision over them. This means their surroundings are still shrouded by the fog, but they are visible and targetable as if they were not within the fog of war. Exposed enemies are treated as visible units by every spell.

Exposing an enemy does not cancel out the effects of invisibility, although it does make their silhouette visible. An exposed invisible enemy has its location revealed, and can even be selected like a visible enemy, but is still almost fully treated as an invisible unit. This means it still cannot be targeted by attacks or single-targeted abilities, and still counts as invisible in terms of abilities affecting them, with a very few exceptions. Some sources of exposure also provide True Sight to fully reveal the enemy, but not all do.

Exposing is a default component of shared vision, so that all spell listed in the previous section expose enemies as well. Besides them, the following abilities expose enemies.

Sources of exposure

Bloodseeker - Thirst

Health threshold: 25%
Exposes every enemy hero once their health drops below the given percentage. Provides True Sight.
Bounty Hunter - Track

Duration: 0.5
Exposes the target enemy. Provides True Sight.
Dark Willow - Terrorize

Duration: 3.5/3.75/4 ( 5/5.25/5.5)
Exposes all hit enemies. Does not provide True Sight.
Disruptor - Thunder Strike

Duration: 6 ( 12)
Exposes the target enemy. Does not provide True Sight.
Lion - Mana Drain

Duration: 5
Exposes the target enemy. Provides True Sight.
Pugna - Life Drain

Duration: 10
Exposes the target enemy. Does not provide True Sight.
Slardar - Corrosive Haze

Duration: 100
Exposes the target enemy. Provides True Sight.
Spirit Breaker - Nether Strike

Duration: 1
Exposes the target enemy during the cast time. Does not provide True Sight.
Troll Warlord - Battle Trance

Exposes the current target of the tranced hero. Does not provide True Sight.
Tusk - Snowball

Exposes the target until the Snowball crumbles. Does not provide True Sight.
Weaver - The Swarm

Duration: 16
Exposes the latch targets. Does not provide True Sight.

Vision interaction with spells[]

Generally, unit-targeted spells require vision over the target, while ground targeted or non-target spells may be cast regardless of vision. Once cast, a spell usually works regardless of vision. Area effects usually do not require vision to affect enemies. Some non-targeted spells that do the targeting themselves may require vision over enemies. There are exceptions to all of these.

The following spells require vision over enemies to affect them

Abaddon – Aphotic Shield area damage
Bristleback – Area Viscous Nasal Goo ¹
Clinkz – Searing Arrows secondary attack ²
Dark Willow – Bedlam attacks
Dazzle – Poison Touch secondary projectiles
Drow Ranger – Marksmanship splinters ¹
Ember Spirit – Searing Chains
Gyrocopter – Rocket Barrage
Gyrocopter – Homing Missile ³
Gyrocopter – Flak Cannon
Gyrocopter – Side Gunner
Harpy Stormcrafter – Chain Lightning
Juggernaut – Omnislash
Leshrac – Lightning Storm
Leshrac – Pulse Nova's Lightning Storms ¹
Lich – Frost Shield area damage
Lion – Mana Drain ^{1 4}
Luna – Moon Glaives
Luna – Eclipse
Maelstrom – Chain Lightning
Medusa – Split Shot
Mirana – Starstorm ⁵
Mjollnir – Chain Lightning
Morphling – Adaptive Strike ²
Nature's Prophet – Wrath of Nature
Night Stalker – Void ¹
Ogre Magi – Ignite
Ogre Magi – Multicast ⁶
Phantom Assassin – Stifling Dagger ²
Puck – Phase Shift ²
Razor – Eye of the Storm
Rubick – Fade Bolt
Shadow Shaman – Ether Shock
Shadow Shaman – Mass Serpent Ward ¹
Skywrath Mage – Arcane Bolt ¹
Skywrath Mage – Concussive Shot
Skywrath Mage – Ancient Seal ¹
Skywrath Mage – Mystic Flare ¹
Spirit Breaker – Charge of Darkness ³
Storm Spirit – Electric Vortex ¹
Tinker – Laser ¹
Tinker – Heat-Seeking Missile
Undying – Soul Rip
Undying – Tombstone
Visage – Soul Assumption ²
Witch Doctor – Death Ward ¹
Zeus – Arc Lightning

¹Requires Aghanim's Scepter.

²Requires a talent.

³When the current target of these spells die, they choose new targets. Only choose visible enemies.

⁴ Mana Drain ends immediately if the target enters the fog of war.

⁵When Starstorm's initial wave requires vision over enemies, the secondary single projectile does not.

⁶When Multicast items and Ignite only target visible secondary targets.

Recent Changes[]

Main Article: Vision/Changelogs

Version

Description

7.23

Firefly no longer grants flying vision while active.

6.83

Vision and Fog of War can now be any numerical value, rather than specific intervals (previously it was 0, 64, 192, 320, 448, 576, 704, 800, 832, 960, 1088, 1216, 1344, 1472, 1600, 1728).
- Previously if you had a vision between the fixed intervals, it would clamp to a fixed value.

6.81

Mystic Snake no longer requires Fog of War vision to bounce.