[ He briefly lost his mind and tried to kill at least two of their group, and sealed his siblings inside a room against their will, where he's been hoarding anything he could get his hands on... ]

Nothing particularly relevant. [ The volcano eruption is obviously the thing to focus on here. ] I'd keep an eye on the Beastmaster's movements. It seems like he's able to influence more than just the animals around him.

[ No need to ask how he knows. ]

I'm looking into the sacrifices, but we're on a tighter timeframe than I thought we'd be.