Sundering stuff established in the Q&A

[Theodric]

Because Venat just did so for vainglory right?

Well, given that she was compelled to inflict genocide upon her own people and then declare the shattered remnants to be her 'children' whilst masquerading as a self declared 'supreme deity' then it's certain something that can be taken as such.

Honestly, people here approaching parody with how much they want to make her evil.

Given that Venat is ultimately responsible for both the Sundering and the Rejoinings, it's a pretty fair reading of her character.