I want to add a little something about Varis branding Zenos as a monster. Did he said that because he killed peoples or because he fused with a primal ?
Imo, it is the latter. I don't think Varis care much about the so called savage population. He care about the threat of the Eikon, though. His son merging with one is a travesty il his mind, that's the reason I think he called him like that. Nothing about morality there.