in the comics there are two protagonists, a mercenary (hunted or adventurer)
the other is a demon that he seals into an ancient (ancient or ancestral or artifact) sword (or sword or weapon) or transforms into a blade (or sword or scythe) or he turns into a weapon (blade or weapon)
comedic slap about a demon who was sealed in a sword that was found by a mercenary
and an old comic
I don't remember exactly, but it's either on hiatus or the author has given up (Discontinued/Abandoned) on the work