This is probably a stupid question, but the second upgrade step on the soulbound items you get for pleasing one of the faces in SSS, like the Slayer's Claw or Survivor's Tusk, is to complete each of the fights associated with that face. But that's what you had to do to get the item in the first place. I just want to confirm that I understand correctly - I have to redo the same fights to get the upgrade; there aren't some other fights in the DLC that I'm supposed to get to or something?
I hope this is the right place to ask. General discussion says no spoilers.