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Siv suggested, as far as I understand, to have a private conversation with Veserod (who is a simple guy), and to come up with a story for the others about the influence of the forest's magic (which everyone who goes there feels). In this situation, only Alessia, Veserod, and perhaps Anders through Kash, would know the truth. But even if Alessia suddenly reveals that she was a former demonologist who, due to her own foolishness, got hurt by the demon she summoned and has since abandoned her craft, no one will kick you out of the group. There might be disapproval of past actions and strong sympathy for your current state, but hardly anyone will reach for their sword. Alessia is like a sister to our characters, not an outsider. Even if the feelings aren't entirely mutual.