Wondrous Item, very rare
While wearing this amulet, all items as you choose of the same type merge into one item of that type that appears as you choose when you attune to them. For example, a flame tongue longsword and a +1 longsword could fuse into one longsword with both effects. If multiple items of this type require attunement, you need only to attune to the merged item once. You may only wear one amulet of binding at a time.