The game is Dungeons&Dragons, and in his profile, there's a note - faction for Heroes V - Dungeon.
And the clues we get, well, it's not quite clear how, but definitely not with direct words-indicators.
Overall, it's not bad, but the problem is that the Ghost also has the Dungeon faction; the clue could be about him. We've already seen that the clues are unreliable, so I suggest we don't worry too much about solving them today. It's better to carefully reread the posts in the thread and try to identify the mafia player based on their behavior.
Anyway, I don't have much time now; I'll think about the clues tomorrow when the days are longer.