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The Fabled Entity Chronos. If you can decipher its true name twice and sacrifice 3 entities (all must be star-aligned), you can summon Chronos to aid you. In addition you will gain 1 star energy every turn, be immune to any time-related cards, can cancel out time card effects (even legendary artifacts) that benefit an opponent, take 1/2 damage from star entities, you can see everyone's hand, and you can restore the last 15 symbols you lost every 10 rounds.