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A divine son of Apito and Taranis whom Carl expects to face again.
Carl first knew Grull through equipment earned after being stepped on by him. The masquerade's history later identifies Grull as the son whose question about masks drew Apito's sacred explanation of the party. As Carl prepares a driver-targeting spell against soul armor, he admits he had been saving the tactic for the next time Grull appeared.
A divine adversary important enough that Carl reserves a specialized counter for him.
Also appears in books you've already read — spoiler-safe to their endings: