The Legend of Zelda: Twilight Princess
Almost every boss in Twilight Princess has multiple phases. Link will get to work, cutting down whatever stands in his way, only for his enemy to grow more powerful. Morpheal begins as a mass of tentacles, only to reveal himself to be a large aquatic beast, capable of leveling stone columns and eating unsuspecting Hylians. Zant, on the other hand, is pretty much a series of unique boss fights, forcing the player to relive past encounters.
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