Revert back to old heating system; instead when an item is fully leveled, you can "overclock" said item using fire crystals, setting the item back to level 1 while keeping its level 10 stats, while rolling between a choice of 1, 2 or 3 UVs on an item.

Locking an existing UV requires respective UV tickets from Punch or Forge Prize Boxes. Likewise you can still roll UVs the usual way with a cost of a UV ticket from Punch/Forge Prize Boxes without the need to level an item.

All options have a chance to obtain a Forge Prize Box, with higher cost options rolling additional chances of rolling a box drop.