Spell lifesteal

Spell lifesteal allows the hero to heal from spell damage they deal. Just like attack damage lifesteal, spell lifesteal is calculated by a percentage of the actual damage done to units. However, unlike attack damage lifesteal, it does not heal for overkill damage dealt to a unit, so if a spell's damage exceeded the target's current health and killed it, the heal is based on the target's remaining health.

Sources of Spell Lifesteal
Multiple instances of Spell Lifesteal from the same source, such as multiple Bloodstones, do not stack. However, Spell Lifesteal from different sources, including different items, stacks additively. Spell lifesteal to creeps are usually $$\tfrac{1}{5}$$ or 20% of the value to heroes.

Item and Abilities
Some items and abilities work with Spell Lifesteal, and some don't. The following lists shows which abilities in-game works and do not work with Spell Lifesteal:

Working
Unit and Item Abilities that can be Spell Lifesteal'd from:

1 The instantly killing effect of these spells also triggers Spell Lifesteal, healing based on the killed unit's remaining health.

2 Despite these spells using separate units to apply their effects, the damage sources of those are set on the caster, so Spell Lifesteal procs and heals.

3 The rum wear-off health loss does not proc Spell Lifesteal.

4 Does not lifesteal off of the area health cost. Only steals life when targeting an enemy to damage it.

Not Working
The following abilities do not lifesteal with Spell Lifesteal:

Recent Changes
Roubo de vida mágico Вампиризм заклинаний 技能吸血