Collector Items
From MoronYard Wiki
Collector Items are Hats or Body Attachments that are created when a regular item is crafted with a Collectors Stone. These items can be leveled up to unlock new and exclusive Rare Effects. The item can have multiple effects that you can choose from by using Charges that are gained by leveling up an item. You can give an item unlimited charges by crafting it with a Sigil of Immortality. You can level up an item infinitely with no level cap, however you get the final available effect at level 120.