From Alathra Wiki

DunkelDemon (DunkelDemon#3544 on Discord) is a demon who arose from the depths of the nether after the death of Astro, previous manager of Viridian Market, who died after an Alchemy incident. He wears a suit at all times, which is torn in some places. Before leaving the nether, he challenged the Devil himself to a duel, and to which he won, and the Devil surrendered his wings and his pitchfork to Dunkel. After arising from the nether, he wandered Gaushan in search of a new place to reign. It is through his search that he located Viridian Market and sucked all the remaining energy out of Astro's dead body, then burying him on a nearby waterfront. He is the current manager of Viridian Market under Arctan's guidance.