How to get rid of Inferno Sword

For some reasons I have an Inferno Sword in my inventory, which can not be deleted or discard. Is there anyway I can get rid of it if it is useless.

Talk to either the npc in weldern north of dwarf or npc in Oren east of dwarf. Then do something like say you don’t want that faction anymore or switch faction something like that and it’ll remove it