Aside from the +10 Judgement set that everyone knows about I've found Steel set pieces with -1/100 durability. I don't know if these will cause issues but I wouldn't keep them around if I was you.
The Curved Twinblade is +10 too. I been looking for the other Items and it seems those (The Judgement set, The Curved Twinblade and the Steel set) are the only ones that are fucked up.
Found some possible illegal items. (4 comments)