MasteR
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Truth potion, aka Albea's action. Therefore, Neyra (most likely) was Peona.
That can't be. The truth potion is only available from the 3rd night onwards. Based on the description, it's closest to Necoran's black magic, in my opinion. I don't see anything else that's similar.
Toxa was either examined or isolated by the guards (no surprise), but someone arranged a friendly duel for Mentu.
Toxa was isolated "with particular cruelty." Mentu, yes, was probably blocked. From the Mafia, there's only 1 action in the newspaper, and considering that using guard and healing together in the first night didn't make much sense, since the first Mafia member is most likely preparing, and the second is unlikely to use their ultimate ability in the first night, and Alm is also unlikely to go and kill randomly in the first night. The absence of order faking in the newspaper looks strange.