Ok...I'd like to change my vote to something kinda ridiculous. I bet that Hinjo will be the next to die.

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Essentially, I'm betting the longshot that Hinjo's rush back to camp in previous comics isn't just to throw them a sending spell warning of Xykon. He's going to have them scried and then teleport himself along with some nameless soldiers as reinforcements. Then, he will die during the struggle for the gate in a suitably dramatic fashion.