Final Fantasy - Opus 15 - Crystal Dominion - Booster Box (36 Packs)Brand New Mechanic: Crystals A portion of the Character abilities and Summons will now appear with a new cost to be paid called different from the usual Crystal Points ( Use abilities and more to gain and experience yet another layer of strategy in FFTCG! Dice or counters can be used to keep track of the number of Crystals, but Crystal Dominion will also include two kinds of premium version Crystal cards, and these can also be used during games!