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Unique Attack Modifier

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Unique Attack Modifiers (formerly known as Orb Effects) are special modifiers that alter a Hero's basic attack to provide an additional effect. An example of this is Morbid Mask, which grants the lifesteal effect. Certain Hero abilities are Unique Attack Modifiers, such as Anti Mage's Mana Break, Broodmother's Incapacitating Bite, and Ursa's Fury Swipes. Not all attack modifiers count as Unique Attack Modifiers.


Contents


[edit] Priority

Multiple modifiers do not stack; for each attack one modifier always takes priority. The order of priority is as follows:

  1. Conditional Modifiers - Modifiers that only occur on some attacks and are not controlled by the player, such as Maelstrom (chance-based) and Mjollnir (chance-based). If a Conditional Modifier fails to proc then a Standard or Ability Modifier will be present on the attack (if applicable)
  2. Ability Modifiers - Modifiers granted by Hero abilities*
  3. Standard Modifiers - Modifiers granted by items, with the oldest one in a Hero's inventory taking priority (priority can be shifted by dropping an item and picking it up again)

* UAMs from hero abilities, such as Viper's Poison Attack, will only be overridden by conditional modifiers if they are set to Autocast. If they are Manually cast, they cannot be overridden.

There are few known exceptions: Eye of Skadi or Orb of Venom, and Lifesteal can be active at the same time. (Lifesteal is granted by Morbid Mask, Helm of the Dominator, Mask of Madness, or Satanic.) Eye of Skadi will also stack with Clinkz Searing Arrows, though only if autocast (not manually cast).

[edit] Abilities that Grant Unique Attack Modifiers

Anti-Mage - Mana Break
Mana Break icon.png
Effect: Burns target's mana and deals damage based on a percentage of mana burned.
Ability Type: Passive
Broodmother - Incapacitating Bite
Incapacitating Bite icon.png
Effect: Slows target's movement speed and blinds him.
Ability Type: Passive
Clinkz - Searing Arrows
Searing Arrows icon.png
Effect: Deals bonus damage.
Ability Type: Auto-Cast
Drow Ranger - Frost Arrows
Frost Arrows icon.png
Effect: Slows target's movement speed.
Ability Type: Auto-Cast
Enchantress - Impetus
Impetus icon.png
Effect: Deals pure damage based on a percentage of distance traveled.
Ability Type: Auto-Cast
Invoker - Forged Spirit - Melting Strike
Melting Strike icon.png
Effect: Reduces target's armor.
Ability Type: Passive
Huskar - Burning Spear
Burning Spear icon.png
Effect: Deals damage over time.
Ability Type: Auto-Cast
Outworld Devourer - Arcane Orb
Arcane Orb icon.png
Effect: Deals a percentage of current mana as pure damage.
Ability Type: Auto-Cast
Sand King - Caustic Finale
Caustic Finale icon.png
Effect: Applies a debuff that causes affected unit to explode and deal damage in an area upon death.
Ability Type: Passive
Silencer - Glaives of Wisdom
Glaives of Wisdom icon.png
Effect: Deals a percentage of Silencer's intelligence as pure damage.
Ability Type: Auto-Cast
Ursa - Fury Swipes
Fury Swipes icon.png
Effect: Consecutive attacks to the same target deal bonus physical damage per attack.
Ability Type: Passive
Viper - Poison Attack
Poison Attack icon.png
Effect: Slows target's attack speed and movement speed and deals damage per second.
Ability Type: Auto-Cast

[edit] Items that Grant Unique Attack Modifiers

Desolator - Corruption
Cost 4100
Desolator icon.png
Effect: Reduces target's Armor.
Ability Type: Passive
Diffusal Blade - Feedback
Cost 3300
Diffusal Blade icon.png
Effect: Burns target's mana and deals equal damage.
Ability Type: Passive
Eye of Skadi - Cold Attack
Cost 5675
Eye of Skadi icon.png
Effect: Slows target's movement speed and attack speed.
Ability Type: Passive
Able to be stacked with a UAM source of Lifesteal.
Helm of the Dominator - Lifesteal
Cost 1850
Helm of the Dominator icon.png
Effect: Grants lifesteal.
Ability Type: Passive
Maelstrom - Chain Lightning
Cost 2700
Maelstrom icon.png
Effect: Grants a chance to release Chain Lightning.
Ability Type: Passive
Only considered a UAM when ability procs.
Mask of Madness - Lifesteal
Cost 1900
Mask of Madness icon.png
Effect: Grants lifesteal.
Ability Type: Passive
Mjollnir - Chain Lightning
Cost 5300
Mjollnir icon.png
Effect: Grants a chance to release Chain Lightning.
Ability Type: Passive
Only considered a UAM when ability procs.
Morbid Mask - Lifesteal
Cost 900
Morbid Mask icon.png
Effect: Grants lifesteal.
Ability Type: Passive
Orb of Venom - Poison Attack
Cost 275
Orb of Venom icon.png
Effect: Slows target.
Ability Type: Passive
Satanic - Lifesteal
Cost 6150
Satanic icon.png
Effect: Grants lifesteal.
Ability Type: Passive

[edit] Orb walk

Typically when you right-click on an enemy hero, the nearby (500 radius) creeps will agro you, and attack you. When you cast spells on enemy heroes this is not the case.

Orb-Walking involves using abilities that have Unique Attack Modifiers. Select the ability once and click on an enemy hero, this is now considered casting an ability; nearby enemy creeps will not attack you. You can repeat this as many times as wanted. Right clicking the ground to move in between casts of your Unique Attack Modifier is where the 'walk' comes in, and allows you to land more attacks on a fleeing enemy.

Conversely, if you enable auto-cast for the Unique Attack Modifier and right-click on a hero, creeps will attack you.