Appearances in Ben 10
Hypnos is the god of sleep and was the guardian spirit of Ben. He helped Ben in Devil's Triumph Part 2. Hypnos lives in the bed of river Styx. Hypnos was rewarded by Pluto to became the god of night replacing Pheles (the original god of night). Hypnos quit the work, he joined the Ethereal Plumbers.
Sword of Consciousness