Seven Kingdoms: Seowyn's Crossing
Acherex is a Firesoul Genasi residing near the City of Brass in the Elemental Chaos. He runs a sort of Tavern and port on a lake of fire that he refers to as a Wayfaring. He seems to either have magic or to possess magical items, and he was able to send Tilly Thistleshanks back to Tol when he had been shifted to the Chaos in a battle with Efreeti. For this service, Tilly agreed to owe Acherex a favor, something the genasi is unlikely to forget.