Calling it now: Belkar will volunteer to be sealed in a stasis trap with Bloodfeast to secure the gate. Per the oracle's prophecy, the gate will never be breached again. A perfect subversion to the expectation that Belkar will die in some way, the culmination of his redemption arc, and a resolution to the Chekov's gun of Serini using volunteers AND the blurring of roles between monsters and PCs.