Power Stone doubles the chance that a gladiator turns into gold foil when a gladius case is opened and the card revealed.
Guild's store needs to be level 8+ to be able to purchase power stones (with merits).
Note that one Power Stone is consumed for every gladiator revealed from a gladius case, whether it is gold foil or not. For one gladius case, one needs 5 Power Stones or some of the gladiators will be opened without the doubled chance to be gold foil.
Related:
Splinterlands Website
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