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Illusory Orb icon.png

Spell damage ( ) is usually damage dealt in a separate instance from attack damage, with some exceptions. This includes all abilities (including item abilities and attack modifiers) which deal the 3 damage typesmagical, physical or pure damage.

Magic spell damage is influenced by magic resistance, physical spell damage is influenced by armor and pure damage is not affected by either. All three underlie damage manipulation.


Spell Damage Manipulation[]

Main Article: Damage manipulation

Stacking[]

All sources of spell damage manipulation stack additively within two categories, outgoing and incoming, which are then multiplied together. The two categories Outgoing Spell Damage Manipulation and Incoming Spell Damage Manipulation stack additively with Generic Incoming Damage Manipulation and Generic Outgoing Damage Manipulation respectively as spell damage manipulation is considered to be just a part of Damage manipulation. Since these are handled separately, the same category stack additively while different categories stack multiplicatively with each other.

For example, spell damage dealt by summons, unless otherwise stated, are not affected by the outgoing spell damage manipulation of the hero. However, summons can be affected by incoming spell damage manipulation since incoming spell damage manipulation affects the target of the damage instead of the caster.

Spell Damage Multiplier is defined as:

Example 1: Incoming Manipulation

Bloodseeker minimap icon.png Bloodseeker with a level 4 Bloodrage buff with Kaya and Sange icon.png Kaya and Sange. What is his current spell damage multiplier?
Spell damage amplification values:
Bloodseeker minimap icon.png Bloodseeker's spell damage multiplier is 1.46 in this example.

Example 2: Incoming and Outgoing Manipulation

Bloodseeker minimap icon.png Bloodseeker from the previous example has Dagon 5 icon.png Dagon 5 and is affected by Mage Slayer. How much actual spell damage Energy Burst will be dealt to Marci minimap icon.png Marci if she is also affected by Magic Weakness (before magic resistance reductions)?
Marci minimap icon.png Marci affected by Magic Weakness will take 1047.84 spell damage (before magic resistance) from Bloodseeker minimap icon.png Bloodseeker in this example.

Example 3: Generic Damage Manipulation

Bloodseeker minimap icon.png Bloodseeker from the previous example instead chooses to cast his Dagon 5 icon.png Dagon 5 on a Spectre minimap icon.png Spectre with level 4 Dispersion. Assuming all other modifiers are the same, how much spell damage will be dealt to Spectre minimap icon.png Spectre (before magic resistance).
Dispersion is generic damage manipulation, meaning it affects all damage dealt to Spectre minimap icon.png Spectre. Despite this, it stacks additively with other incoming spell damage manipulation like Magic Weakness when calculating spell damage.
Spectre minimap icon.png Spectre affected by will take 870.24 spell damage (before magic resistance) from Bloodseeker minimap icon.png Bloodseeker in this example.

Outgoing Spell Damage Manipulation[]

A unit that has outgoing spell damage manipulation deals more or less spell damage with any spell damage they apply to any unit. Multiple sources of outgoing spell damage manipulation stack additively.

Outgoing Spell Damage Manipulation Sources
  • Counterspell icon.png
    Aghanim's Shard Upgrade
    Outgoing Spell Damage Reduction: 10%
    Close Additional Outgoing Spell Damage Reduction: 20%
    Aura, passively reduces all spell damage coming from enemies within 900 radius. The close aura applies to enemies within 300 radius. The 2 auras stack additively with themselves.
  • Bloodrage icon.png
    Outgoing Spell Damage Amplification: 15%/20%/25%/30% (Talent 23%/28%/33%/38%)
    Duration: 8
    Applies a buff on the caster or ally hero.
  • Bloodthorn icon.png
    Outgoing Spell Damage Reduction: 35%
    Duration: 6
    Reduces all spell damage dealt while affected by the debuff.
  • Overcharge icon.png
    Outgoing Spell Damage Amplification: 8%/10%/12%/14% (Upgradable by Aghanim's Shard. 18%/20%/22%/24%)
    Duration: 8
    Applies a buff on the caster and transfers to the Tethered ally as well.
  • Mage Slayer icon.png
    Outgoing Spell Damage Reduction: 35%
    Duration: 6
    Reduces all spell damage dealt while affected by the debuff.
  • Morph icon.png
    Aghanim's Scepter Upgrade
    Outgoing Spell Damage Amplification Change: Upgradable by Aghanim's Scepter. 20%
    Grants Morphling minimap icon.png Morphling bonus outgoing spell damage amplification while reducing the affected target's.
  • Nether Ward icon.png
    Outgoing Spell Damage Reduction: 8%/12%/16%/20%
    Aura, passively reduces all spell damage coming from enemies within 1400 radius.
  • Arcane Supremacy icon.png
    Outgoing Spell Damage Amplification: 14%/18%/22%/26%
    Passively increases Rubick's spell damage.
  • Talent Left 4.png
    +40% Spell Amp For Stolen Spells:
    Only amplifies abilities stolen with Spell Steal.
  • Soul Catcher icon.png
    Outgoing Spell Damage Amplification Per Dubuff: 5%/7%/9%/11%
    Duration: 10
    Grants spell amplification based on the number of heroes affected by the spell.

Talents[]

The following heroes have a Talent talent that grants them outgoing spell damage amplification.

Bonus Level 10 Level 15 Level 20 Level 25
Left Right Left Right Left Right Left Right
Spell Amplification
  • Jakiro minimap icon.png +6%
  • Phoenix minimap icon.png +6%
  • Ancient Apparition minimap icon.png +8%
  • Nyx Assassin minimap icon.png +8%
  • Grimstroke minimap icon.png +15%
  • Timbersaw minimap icon.png +8%
  • Tinker minimap icon.png +10%
  • Lina minimap icon.png +11%
  • Void Spirit minimap icon.png +12%
  • Earth Spirit minimap icon.png +18%

Item Sources[]

Many items grant their owners a spell damage amplification bonus by giving them a direct bonus. The effects are limited to the item's owner, which must have the item equipped.

Bonus Spell Damage
Item Value Item Cost Cost/Value Point
Ethereal Blade icon.png Ethereal Blade 12 4650 Gold 387.5 Gold
Fairy's Trinket icon.png Fairy's Trinket 5 N/A N/A
Kaya icon.png Kaya 8 2050 Gold 256.25 Gold
Kaya and Sange icon.png Kaya and Sange 16 4100 Gold 256.25 Gold
Nether Shawl icon.png Nether Shawl 6 N/A N/A
Timeless Relic icon.png Timeless Relic 15 N/A N/A
Vambrace (Intelligence) icon.png Vambrace (Intelligence) 6 N/A N/A
Yasha and Kaya icon.png Yasha and Kaya 16 4100 Gold 256.25 Gold
Values may include portions from actives or auras.


For Kaya icon.png Kaya-based items: Multiple sources of spell damage amplification do not stack.

Incoming Spell Damage Amplification[]

A unit that has incoming spell damage amplification debuff on them takes more spell damage, and multiple sources of incoming spell damage amplification stack additively. Incoming spell damage amplification affects every source of spell damage, except for damage flagged as HP Removal.

Abilities[]

Incoming Spell Damage Amplification Sources
  • Hunter's Boomerang icon.png
    Aghanim's Scepter Upgrade
    Incoming Spell Damage Amplification: 25%
    Debuff Duration: 7
    Tosses an arcing boomerang at a target unit or point, which returns to Hoodwink minimap icon.png Hoodwink.
    The boomerang slows, damages and applies an incoming spell damage amplification debuff on all enemies it hits or travels through.
  • Veil of Discord icon.png
    Incoming Spell Damage Amplification: 18%
    Duration: 16
    Places an incoming spell damage amplification debuff on enemies in an area.

Exceptions[]

There are certain cases of abilities that ignore both types of spell damage amplification, and those abilities usually cannot spell lifesteal. In general, abilities with health manipulation mechanics (Instant Kill, HP Removal, Delayed Damage etc.) are not affect by both types of spell damage amplifications.

However, the following abilities are not affected by outgoing spell damage amplification, but they are affected by incoming spell damage amplification (except for Magic Weakness):

1 Upgradable by Aghanim's Shard. The damage of the bouncing attacks are unaffected by outgoing spell damage amplification. The Intelligence attribute symbol.png-based damage is fully affected, including that of the bounces.
2 Talent The damage of the bouncing attacks are unaffected by outgoing spell damage amplification. However, Overload's area damage is fully affected, including that of the bounces.
3 Upgradable by Aghanim's Scepter. The damage of the bouncing attacks count as spell damage, but are unaffected by outgoing spell damage amplification.

Version History[]

Version
Description
  • Magic Weakness no longer amplifies spell damage that is not affected by outgoing spell damage amplification. [?]
  • Damage return from Blade Mail icon.png Blade Mail is no longer increased by outgoing spell amplification.
  • Moon Glaives no longer gets boosted by outgoing spell amplification.
  • Cleave no longer gets boosted by outgoing spell amplification.
  • Spell lifesteal does not trigger heal for things that don't receive spell amplification ( Moon Glaives, Cleave).

Patch History[]

Patch
Description
  • Alt now show their modified/increased spell ampification values at tooltips.


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