Nezzla was a humanoid demon species. They were guardians of the Orbs of Nezzla'Khan and their cavern lair was protected by a barrier that only they could cross. However, the Trio devised a way to overcome the demons' barriers by having Jonathan Levinson wear the skin or armor of a demon they captured and killed.
Powers and abilities
Nezzla demons possessed a thick hide that would resist all kinds of damage and was the only known way to penetrate the mystical barrier they use to protect their orbs. They were extremely resilient and could resist a taser with voltages powerful enough to knock out a fully-grown elephant (they required a few more jolts to knock them out completely).