WARNING: This is a spoiler discussion.

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So do you think Estinien will live to be part of future events (most likely just minor side events) or die in 3.X era Main Storyline? As of now there is only two outcomes with Estinien's fate now being either life or death.

His body is only possessed by Nidhogg so it may be possible to save him if we can find a way to remove Nidhogg's eyes influence on him but then again we may be forced to kill Estinien so we can kill Nidhogg for good.

So I'm beating Estinien may die in 3.X era.