Abilities

Abilities are unique skills that heroes and creeps have access to on the battlefield. They range from simple passive effects, to devastating explosions of energy, to complex, terrain changing feats. All heroes have four or more abilities, three or more basic abilities and an ultimate ability, that they can assign ability points to every time they level up. Every level in an ability makes it more powerful, sometimes increasing its mana cost as well.

Abilities can consume mana, and may also be placed on cooldown when used. Abilities that are on cooldown cannot be used until their cooldown timer is up, at which point they can be cast again. Abilities with low cooldowns are sometimes referred to as "spammable" abilities, because they can be used very frequently.

Upgrading Abilities
Every time a hero levels up, they earn an ability point, until their abilities are fully upgraded. The player can then spend the point to unlock one of the hero's abilities, or to upgrade an already learned ability. At the start of the game, all of a hero's abilities are locked, but they each start with one ability point which can be used at any time. Abilities cannot be used and do not have any effect if they are still locked. After an ability is unlocked, it can be upgraded several times. Basic abilities can be upgraded 3 more times, for a total of 4 levels, and a hero's ultimate ability can be upgraded 2 times, for a total of 3 levels at hero level 6/12/18.

The exceptions to this are:
 * , who can upgrade his basic abilities 6 times (total of 7 levels).
 * , who can upgrade his ultimate abilities on levels 4/11/18.

Upgrading abilities will make them more effective. Depending on the ability, upgrading the ability may increase the amount of damage, increase the duration of an ongoing effect such as a disable, or otherwise improve the ability.

Sometimes, upgrading abilities will also increase or decrease the mana cost. For example, each level in 's increases the damage it deals and the duration of its stun, but also increases its mana cost.

Besides directly leveling abilities, there are a few other ways to make abilities more powerful. Spell Amplification is a mechanic which increases the amount of damage of abilities slightly. and are special items which can enhance each hero in a unique way. Depending on the hero, it may enhance the power of their ultimate ability, improve one or more basic abilities, or in some cases, Aghanim's Scepter or Aghanim's Shard even grants an entire new ability.

Some heroes also have an ability that improves their other abilities further. For example, 's makes his other 3 abilities more powerful.

Basic Abilities
Basic abilities can be upgraded to a new level once every 2 levels. This means that a level 2 hero cannot upgrade a learned basic ability to level 2. Every 2 levels, a hero increases his maximum basic ability level by 1. Ultimate abilities can only be upgraded every 6 levels, starting from level 6. These ultimate abilities are usually more powerful than a hero's basic abilities.

Ultimates
A hero's last ability, which can usually be trained at level 6, level 12, and level 18, is called an ultimate. There is only one exception to this level restriction: 's, which can instead be upgraded at levels 4, 11, and 18.

Ultimates can be high-impact abilities that define a hero's strengths and playstyle; they often have a devastating effect and a long cooldown. In some cases however, they are not the main strength, but just synergize very well when combined with the other abilities. Some ultimates have a lower effect but are spammable due to a relatively short cooldown. Ultimate abilities can also be passive abilities.

Ultimates, unlike normal abilities, are usually able to target a unit under a spell immunity effect, such as. They will rarely damage such a unit, but other effects such as slows or stun will usually apply. This makes ultimates, especially those with stun effects, incredibly powerful, since enemy heroes cannot block the effects.

Sub-abilities
Some abilities comes together with sub-abilities. These extra abilities usually do nothing on their own and mostly are only active after the ability they come with was cast first, or in some cases, they serve as a set-up for other abilities.

Their tasks range from activating the effects of other abilities on demand, manipulate abilities or even fully cancel them when desired. Usually, these abilities are innate, or are unlocked after learning specific abilities.

Since these abilities usually have a very low or no cooldown at all, they usually do not trigger abilities which react on ability usage, like -based items' charge gain or 's per ability cast penalty. Sub-abilities are automatically acquired with or  together with the main ability. If the caster does not have the required item (e.g. or ) for unlocking the sub-ability, the sub-ability does nothing.

Innate Abilities
All heroes have the following innate abilities:

Linked Abilities
Linked abilities are learned automatically when their counterpart ability is learned and vice versa. It usually has its own ability slot and automatically levels up with its counterpart ability. They are different from toggleable abilities with different states (e.g. ) and sub-abilities.

Charge-based Abilities
Some abilities (both basic and ultimates) use an alternative cooldown system based on charges and a replenish time, with each ability cast consuming one of its charges.

Ability Types
An ability's type refers to how that ability's effects are applied.

For abilities listed by their ability and targeting type, see here.

Active
Active abilities must be used in order to apply their effects. Active abilities can consume mana, have cooldowns, and usually have some method of targeting related to them. The majority of abilities are active abilities. They can be activated by pressing their associated Hotkey.

If an ability can target the caster, double the Hotkey causes them to activate immediately on the caster.

Active abilities are indicated by a bevel around the icon, which makes them look like a button. When an ability gets used and enters its cast animation, the bevel turns green and the icon shifts, looking like a pressed button. When selecting a targeted ability, the icon and the bevel appear brighter until the ability gets deselected or the cast begins. Active abilities also have a hotkey displayed at the top left corner.


 * Examples of active abilities are 's, 's , and 's.

Passive
Passive abilities apply their effects either permanently as soon as they are learned, or activate by themselves if the ability is learned and its requirements met. These requirements can range from attacking a unit, casting a spell or even getting attacked. Most passive abilities do not consume mana and usually do not have cooldowns, exceptions include 's. Most heroes have at least one passive ability, though not all do.

Passive abilities do not have a bevel and look like they are pressed into the hud. Since passive abilities cannot be used manually, their appearance never changes. Passive abilities only have an icon displayed upon learning.


 * Examples of passive abilities are 's, 's , and 's.

Autocast
Autocast abilities are special active abilities that can be toggled on or off, or manually cast.
 * mouseright on ability to toggle autocasting on or off.
 * Alt is the default hotkey to toggle autocasting on or off.

Disables such as silences and stuns do not prevent a unit from toggling its autocast abilities on or off. However, autocast abilities cannot be used when silenced as with all other spells. Most auto-castable spells are active attack modifiers, applying a modification to the user's attacks when activated. When toggled on, the ability will apply whenever possible. For example, 's will be used whenever she attacks a target. When toggled off, they will not be used and will not consume mana. When an active attack modifier is manually cast, it is partially treated as a spell cast instead of as an attack. This causes nearby enemy creeps to not aggro when using them that way. This is also known as orb walking.

Not all abilities with autocast are attack modifiers. A few of them are regular abilities, which, when toggled on, will automatically be cast when their requirements are met. An example of such is 's. When toggled on, Ogre Magi will automatically cast Bloodlust on nearby allied heroes.

is similar, but a special case, as toggling it on does not make autocast Devour. Instead, the toggle state determines whether Doom will copy the target neutral creep's abilities or not. When toggled off, Doom does not acquire new neutral creep spells. When toggled on, he does.

Auto-castable abilities have almost the same appearance as regular active abilities. They also have a bevel which turns white when selected and green when casting. However, they do not turn green for attack modifiers. On top of that, they have a thicker second bevel behind the first bevel. This one glows orange when the ability gets set to autocast.

These are the only auto-castable active attack modifiers:

These are the only auto-castable active abilities:

Targeting Types
Active abilities and autocast abilities are targeted in different ways, depending on the effects of the ability.

No Target
Abilities with no target requirement are immediately cast as soon as its button is pressed. Many of these abilities do not have a cast time. However, they do not have an instant cast time. They cannot directly target a unit or a point. They usually affect the caster or units around the caster. They can affect an area around the caster, or have a global effect.


 * Examples of instant abilities are 's, 's , and '.

Toggle
Toggle abilities are always non-targetable. These abilities apply a periodic effect and often drain mana or health as long as they are toggled on. These effects can range from damaging or healing nearby allies, switching between attack types, and manipulating other abilities of the unit. If the toggle ability drains mana over time, it turns itself off once not having mana to support it anymore. They cannot be forcibly turned off by anyone but the player by pressing their button again, or by dying. Like regular spells, they cannot be used (in this case, turned ) while affected by disables which prevent ability usage. However, once they are toggled on, they persist through any form of disabling, including silence.

All toggleable abilities have an instant cast time by default.

Target Point
Point-target abilities require the caster to target a point or an area. Upon pressing the Hotkey, the cursor turns into a crosshair that determines where the ability will be cast, or in which direction it will be cast. Point targeting abilities can have very varying effects. For some abilities, it merely determines the direction to launch an effect, for other abilities it determines an exact point where an effect will be applied.


 * Examples of point target abilities are ', 's , and 's.

Target Area
Area target abilities work like point target abilities, with the only difference being that they require the caster to target a whole area, instead of a point. Upon pressing such a spell's button, the cursor turns into a targeted area indicator which shows the area the ability will affect. Upon cast, these abilities usually affect the whole targeted area, or all units in the area. Some apply their effects once upon cast, and some apply a lasting effect which affects units which enter the area after cast.


 * Example of area target abilities are 's, 's and 's.

Vector Targeting
A vector targeted spell requires two locations to be chosen. The first location determines the starting location of the spell, while the second location determines the direction. There are different ways to select the second location, based on which casting type is used:


 * Regular cast: Select the ability with its hotkey. Then move the cursor to the desired start location and hold down the left mouse button. Now move the cursor to aim toward the desired direction. Release the left mouse key to select the direction.
 * Quick cast on key up: Move the cursor to the desired start location, then press and hold the ability hotkey to set the start location. Now move the cursor to aim toward the desired direction. Release the ability hotkey to select the direction.
 * Quick cast on key down: Move the cursor to the desired start location, then press the ability hotkey to set the start location. Now move the cursor to aim toward the desired direction. Press the left mouse button to select the direction.





Target Unit
Target unit abilities require the caster to directly target a unit, and cannot be used on the ground. Upon pressing an ability's Hotkey, the cursor turns into a crosshair that determines on which unit the ability will be cast on. Most unit targeted abilities affect only the target. Abilities that apply their effect to a single unit are often called "single target abilities". When targeting a unit out of cast range, the caster follows the unit until it gets in cast range or the target cannot be targeted anymore (e.g. the target turns invisible).


 * Examples of unit target abilities are 's, 's , and 's.

Combinations
Some of the targeting types can appear combined.

Target Point or Unit
Some point targeted abilities may also be able to directly target a unit. In such cases, the spell is cast towards the targeted unit's current location. If the target unit is out of cast range, the caster follows it until it is within range and casts the spell on the unit's position. Even when the target moves during the cast animation, the spell is still cast on it, or launched towards it if it is a traveling effect. This does not cause the spell's actual effects to home in on the target.


 * Examples of point target abilities which can also target units are 's, 's , and 's.

Target Unit with Area Effect

 * A few single-target abilities have an effect which affects an area around the primary target. Like unit targeted abilities, these must be directly cast on units, and cannot be cast freely on any area. Such abilities have their own targeting cursor, which resembles the targeting cursor of ground targeted area spells. They have the same blue ring like area targeted spells, and have pulsing gapped rings which start at the center and move outwards. At the center, they have a small yellow reticule, indicating that a unit must be targeted.


 * Examples of unit target abilities with area effects are 's, 's , and 's.

Cast Event
A small number of spells react on abilities being cast, meaning they trigger certain effects when affected units cast abilities. Abilities reacting on spell casts are:

For balance reasons, the following abilities do not trigger any on-cast event:
 * Active attack modifiers
 * Item abilities
 * And the following listed abilities:

There is one sub-ability and one active attack modifier which do trigger on-cast events. Whether they are intended to do so or not is unknown. This includes the following:

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