[s2e8] The Book Of Destiny -

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After using Dark Magic in the previous episode to save Rayla, Callum is in a coma-like state, undergoing a "spirit vision." [S2E8] The Book of Destiny

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Callum, Rayla, and Ezran continue their climb to save the dragon prince, Zym. The environment itself is a psychological gauntlet. Callum is in a coma-like state