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Damn, I don't have time to listen to the answer anymore. But I'll still share my idea about the "barbarian." Let the city think about it while I'm gone.
So, why did everyone decide it was an executioner? If there was a dent on the skull...
Anyway, a severed head makes me think of Sleepy Hollow in Vistrit's profile. I don't know, maybe I'm wrong. And maybe it was still an executioner who killed him. But that's the only thing I found after studying the profiles. For now.