Zodiark's Codex entry what do we think about it?

[Lurina]

I wouldn't call it annihilating, as life still exists. If anything, the Convocation's plan is essentially "replace X Ancient souls with X new souls." Basically just replacing life with the same amount, with them only wanting their own lives to matter here. Venat's is essentially "Cleave X souls and world into 14, multiplying them into Y souls," with 14X = Y being the mathematical formula. Does it change the fact it was horrific? Oh hell no, but in the end it made more life than it took.

I mean. Even if you put aside that everyone currently alive effectively died, I wouldn't bet on it. Going from a post-scarcity society to a hunter-gatherer one probably entails a die-off that makes the Bronze Age Collapse look like an outbreak of chicken pox.