All I remember is the MC had a sword that had a low probability to destroy other swords it went against and I believe it was cursed. I don't think he really ever used the sword either. I really can't think of the series, hoping by some miracle one of you somehow knows what I'm talking about and that I'm not just crazy.
Ooo, I think I've read it... I can't remember either. Everything I've read is on my reading list, but that's a lot to go off of. Sorry.
The only thing that come ups to mind Everyone Else is a Returnee. I know for sure that this isnt the one though but just in case Edit: I think it is Limitless Sword God