Drain Life is a monsters-only spell which functions like Yredelemnul's Drain Life ability, dealing negative energy damage to every enemy in the caster's line of sight and restoring half the damage dealt to the caster. In effect, this allows the enemy to smite you and all your allies and heal itself in a single action. Negative energy resistance reduces its effect, negating it entirely at rN+++.
The following enemies cast Drain Life:
Drain Life was added in 0.12.