The problem with Zenos is that we already know all about his past and why he does... pretty much everything. With the Ascians, we literally knew nothing about their motivations until ShB.
The fact is, Zenos' past is super boring and has nothing interesting going on in it. He's the spoiled, coddled son in the royal family of Garlemald and was the Ace at everything he did. To the point that he never got challenged anywhere by anyone and he was perpetually board. The only time he wasn't board was when he was a teenager and someone from the provinces who was his sword tutor tried to semi-humiliate him with a fighting style that made use of aether attacks. Zenos did a bunch of homework on how that fighting style worked and jury-rigged a way for him to use aether even though he was a Garlean. This so infuriated his tutor that he dropped his cover as a tutor and tried to kill Zenos. Zenos killed him instead though and realized that in the brief moments of trying to figure out how his tutor/assassins aether attacks worked was the most challenged he had ever been. And he missed that feeling.
Ever since then, he has been searching for someone who could hope to match his battle prowess and actually cause him to get an adrenaline rush while fighting. The only person who has ever managed to give him any trouble was the WoL and Zenos promptly commits suicide afterwards rather then never feel that good again.
Even after he's come back to life, he's still obsessed with getting a bigger and better combat rush. Even if that basically means undoing the forces that are holding reality together as we know it.
And that's literally all there is to Zenos' motives.
Like... if you are going to be fighting over if the current reality should go on existing or not, at least make the reason reality might not exit not be that someone was just looking for a bigger and better combat high. That would be the most stupid reason I've ever heard for someone destroying the world.



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