Nezix

"Look deep within yourself...and realize, that you are nothing but a speck of darkness in a universe full of specks of glimmering light."

Nezix was a cosmic spirit whose primary power lied in the soul and psyche. It's not exactly known how Nezix came into being, though he's speculated to originate from the Great Universal Revolution. He was an evil spirit, whose found purpose lied in feeding on the wills of the weak and penetrating the minds of the strong and powerful. He served as the Neo Lookout Crew's final antagonist, in his reign of Cosmic Terror.

Analysis
It is possible Nezix has existed since the beginning of time, for millions of years, or only since the universal revolution three centuries before his defeat. Some speculate he is Ninthalor in spirit form.