Drain removes it from the enemy but does not give any of it to you.
So I'm not sure if it is really "drain" think final fantasy drain spells (if that was what you intended it only does half the effect) even Warcraft describes it as "
Definition
Drains do exist in two forms: Mana Drains and Life Drains. The definitions of those two normally slightly differ. Common understanding is:
- Mana Drains are abilities, which remove mana from the enemy's mana pool. They normally have a secondary effect.
- Life Drains are abilities, which transfer life from the enemy and add it to one's own.
Currently, almost all of these spells are Shadow spells."
However yours only does the first part "remove life from the enemy" but does not add it to yours.