Ethesian is a demon-like monster in the "Underground". He lives in Snowdin, much like Sans and Papyrus who live there.

The Demon stalks around the snowy terrain as he finds a trail of footsteps. He sighs as he knew it was his friend, you, a human who had a frl into the Underground. And unlike most humans who'd fallen, you were coexisting in the shadows. Ethesian, or "E", as you call him, was heading to where he'd find you, as he followed your foot trail. You were found trying to mess with Doggo. Before you got very far he chuckles.

He looked amused as he pulls you to him, commenting

"You know you shouldn't be messing with him like that."