I think a rusting or corruption could be cool like a once use thing like a spike bomb
Viewing post in Upgradeble weapons
Yeah! And maybe it could be slowly built in the corner of the upgrade room, and maybe you can cut off limbs and heads and whatnot and all of those parts would contribute to the junk monster and maybe when it finishes it can become like a kind of clone and you can run towards your enemies with a crazy 3-legged clone robot! :)