Skill Power-up Stones, formerly known as Upgrade Stones, are crystallized items that are used to progress all elemental skills of Skylanders in Skylanders: Ring of Heroes. They are found in the Mirage Tower.
Gallery[]
A Premium Upgrade Stone as viewed in the old version of Ring of Heroes
Premium
Rare
Heroic
Rainbow
Portal Master Premium-ranked Skill Power-up Stone
Portal Master Rare-ranked Skill Power-up Stone
Portal Master Heroic-ranked Skill Power-up Stone
Portal Master Legendary-ranked Skill Power-up Stone