Poison Elementals are a Poison enemy found in the dungeon.
Poison Wave Edit
After a chargeup, sends a fast moving wave that poisons heroes in its path.
Poison Nova Edit
Creates an explosion of poison around the elemental.
Try to stand far away to bait the poison wave, then go in and hit it while it's paused. Immediately after dying, it releases a poison nova.
Elementals drop Poison Essence which heals and prevents poison.