Whirbets and Minibets can equip a variety of Stones to increase the types of magic they have access to. Whirbets can equip up to three Stones, while Minibets can only equip one.
Stone colors are the same as Whirbet/Minibet colors, and Stones can be found through exploration. Stones equipped to a Whirbet or Minibet are shown on their profile.
Stones can also be obtained through the shop, albeit as mystery purchases.
Stones do not currently have a use in the ARPG but one is planned.