Ple-Sen
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maybe Ple-sen is a demonologist? ..after all, the stone suits him, as well as the ear (see the profile of dark elves (race and clan)), and he also didn't move in the first turn, maybe because he was blocked? after all, someone came to him
Added 1 minute ago
Shut up, murderer! :D)
And it's obvious that Ple-sen is the villain...))
By the way, the third murder is most likely the work of a blood brother...))