For me I think there will be a good chance that he will be killed off, which is a shame since he’s one of my favorite characters. But maybe he could become the first eliksni guardian
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I'm pretty sure the curse will cause him to go on a rampage in the city, and Eramis will escape her cell and stop him. Then He'll ask her to kill him and lead house light till Eido is ready, which the vanguard will probably pardon her for defending the citizens of the last city.