The Bloodworm Helm is a helmet quest item that is part of the Mages Guild quest The Bloodworm Helm. It must be returned to Hannibal Traven at the end of the quest and cannot be subsequently retrieved. The level 1-4 helm also allows one to cast the apprentice-level version of the Essence Drain spell when wearing the helm. The higher level versions of the helm are supposed to also provide higher level Essence Drain spells, but there is a glitch in all of the helm scripts.