8-level Evocation
Cascade, then Cascade again. (To Cascade, randomly select a prepared spell in your spellbook with casting level less than this spell. You may cast that spell as this effect resolves without expending a spell slot. Casting restrictions are ignored.)
Deal Xd8 damage to all enemies within the chosen radius for X rounds, where X is the sum of all levels of spells you have cast this round.
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