I think I might have stumbled upon a very severe bug. It's connected to the video above. So, if you can leave the arena with the inventory from ZS still loaded, you can actually keep an item with modified damage (?!). Not completely sure, but your signs use damage factor, and if I can walk out of there w/o inventory reset (which deletes any items that use ZS slots) - this means I should be able to keep a sword with, say, 50 damage? I will test this now and update my post when ready. EDIT: Tested it with 50 damage iron sword, it seems to deal the same damage as a normal one. Also, I had an INSTANT KILL outside of the arena, it didn't have any effect on another player.