Dota – What orb effects can be stacked in Dota and Dota 2

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I was wondering what orb effects can be stacked in Dota and Dota 2.
Why eye of Skadi and helm of dominator orbs effect can be stacked?

Best Answer

As of patch 7.07 : all Orb Effect (Unique Attack Modifiers) have been removed. Lifesteal can stack additively with itself. Only Manabreak (Antimage) doesn't stack with Feedback (Diffusal Blades).

Tehcnically, no Orb Effects stack. That's why they're Orb Effects (or UAM : Unique Attack Modifier in DotA 2). However...

From items

Some items applies a debuff which could be (or was) concidered as an Orb Effect but is not :

  • Eye of Skadi : "On ranged heroes, Eye of Skadi can be combined with a lifesteal Unique Attack Modifier". So only a lifesteal, no Skadi + desolator for example.
  • Vladimir's Offering : Lifesteal from Vladimir's Offering is not concidered as an Orb Effect however the lifesteal is reduced on ranged heroes.
  • Lesser Maim (15% chance to get 20% attack speed and movement speed slow on your target) on Sange (or Heaven's Hallberd) used to be a Orb Effect but no longer is one.
  • Greater Maim (16% chance to get 30% attack speed and movement speed slow on your target) on Sange and Yasha used to be an Orb Effect but no longer is one.
  • Manabreak on Diffusal Blades used to be an Orb Effect but no longer is one.

The Orb Effect chain lightning from Mjollnir (and Maelstrom) depend on if you proc it or not (25% chance). When you do not proc it and if you have another orb effect in your inventory, it will be applied. Basically you can lifesteal, corrupt (desolator) etc. between each chainlightning.

That also mean that on a ranged hero you can have Skadi + Lifesteal (Mask of death, Mask of madness, Satanic) + Mjollnir/Maelstrom and a Sange and Yasha and you would benefit from all passive debuff.

From skills

Orb Effect can be provided by some skills in the game aswell. Some of those are passive like Manabreak (Antimage). Some are manually casted or autocasted such as Drow Ranger's Frost Arrow, Viper's Poison Attack, Enchantress' Impetus, Outworld Devourer's Arcane Orb etc.

When dealing with Orb Effect from skills, same rules apply for stacking them (Sange and Yasha works, Vlad stacks too but less lifesteal on ranged hero etc.). For casted one : when you are not using a Manually/Auto casted Orb Effect (like those mentionned above), you can apply another Orb Effect from a purchased item (A common example is Drow + Helm of the dominator : You will want to manually slow your target while you lifsteal between each Frost Arrow).

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