Quote Originally Posted by Garnix View Post
an explanation regarding how Themis, Hephaistos and Hades were the only 3 survivors of the sundering
There's been two references to such, though one was in a live letter Q/A, and the other was in the Emet-Selch story that featured as a cross-over event in the Nier mobile game.

The former suggested that Venat might've purposefully let the unsundered escape due to knowing of their involvement in the causal loop which is...yeah.

The latter just states that Emet-Selch and company "barely survived" by mustering all of their strength to resist the effects of the Sundering.