Arandor
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if the sorceress was poisoning, then it was most likely Zubra (judging by the dream), but a necromancer could also have visited him, hence the graveyard... but the dwarves are unclear why.
Revan, your theory is quite plausible) although the warlocks could have simply skipped their turn, who knows.
Wedma, the demons (I'll call them that for short) could have deliberately gone to kill you in order to later accuse Magnus... in any case, it's not a certainty.
but it seems we'll have to look for the killer based on yesterday's clues.
Be strong. Believe