It seems like the portcullis leads to the same place, after all... This chamber is like a corrupted version of the elements themselves. Soiled water, defiled earth, tainted air, and insatiable flame without light...

Gustav already has his own plans, but Kellon looks back pleadingly at Anton. "Lad, tell me that there's something in your books about kicking this house in its teeth. I don't feel like feeding the sharks any chum today!"
Spoiler: OOC
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Religion check to see any way to disrupt the ceremony: (1d20+1)[10]
Insight check for a gut feeling about whether there is an alternative Gustav's willing sacrifice (or throwing anyone in the party on the chopping block): (1d20+5)[10]