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After you decapitated him, you make certain to destroy the remains so he can't return as an undead. The remains of his rod you also destroyed. The amount of undead Somon had raised in the crypt, combined with the defeat of the adventurers (and your rather aggressive swarm tactics) is too much for the militia and they flee the village leaving it to the mindless dead.
You go to the watch tower with some of the more cognizant undead to contemplate your future. Krom even fishes your gear out of the well for you.