One god under two names, across The Olympian Order and The Etruscan World.
Charonkair-onFerryman of the Styx — gatekeeper of the deadThe Olympian OrderCharuncha-runHammer-Wielding Death-Demon — striker of the dyingThe Etruscan World
Why the sources call them one god
the form was eventually assimilated to the Greek Charon (the ferryman of the dead)