Void Curse

You select one target and focus Void energy into their body. The target becomes cursed by the Void. The target slowly takes Void damages which include 3d4+2 fire, and 2d8+2 psychic damage every round until they are killed. When the target is killed the creature is disintegrated and their particles are teleported into the Void. When the target's particles have been sent you gain their last hit points in temporary hit points, last being the number before they died.