Well, this certainly looks like a K’tonian artifact but if you notice the grooves on the bottom, that means that this was actually made on a Jiyong potters wheel as an imitation of the K’tonian style of pottery. This is a replica, albeit a 700 year old, very good replica. I do happen to know a buyer who would be willing to pay you for it.
This magic greatsword has a minimal effect verses the unarmored but becomes more powerful vrs chain, then plate.Monsters
are mostly considered hide but some like dragons would be plate