9. Knights of the Round
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Knights of the Round first appeared in Final Fantasy VII as one of the biggest secrets of the game, and one of the most powerful attacks. During the lengthy minute-long summon, the thirteen Knights of the Round Table take turns attacking the enemy, one by one. The attack costs 250 MP and can do over 100,000 damage, meaning there’s almost nothing in the game that can survive one Knights of the Round.
The summon would later appear in Final Fantasy XIV as the final boss of the Heavensward expansion.