Ment
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Ver, forget about Cerberus: it seems like this is a clue, but looking for a mountain archer would be a strange move.
Vis, it doesn't seem like anyone is planning to execute anyone. But at least this situation is a reason to think. If additional information appears, then one of you will, of course, leave us.
Spir, you explained the theoretical roles well; I think this table will be useful if needed.