How do the [rare] skins work?
They work the same way as the skins from Moto, except for the fact that they drop from chests, and are not bound in anyway, meaning you can sell them on the TP.
So they also can only be used once, and then they’re gone for good?
"Gone" in the sense that you no longer have the "put skin on item" item in your inventory, yes. You can keep using the skin, however, via transmutation stones (under 80) and crystals (80; formerly known as fine transmutation stones).
They can be used as many times as you want, but after the first time you need to use a transmutation stone to transmute.
Please take your tinfoil hats off and be reasonable. ~ReginaB
This forum is a wretched hive of scum and villainy. ~DevilLordLaser
This forum is a wretched hive of scum and villainy. ~DevilLordLaser