Among the hundreds of possibilities Veris had about this war, getting defeated by Zulcriz was also one of them.
She envisioned this situation in which her Emissary and her Apostles failed to defeat the other side. That's why she has already considered what she could do if something like this happens.
Looking at Zulcriz, she asked, "Before I give my answer, tell me this, Zlucriz—if I were to grant you immortality, would you dare conspire against us?"
"Sister?"
"Eh?"
"What are you even saying? Granting him the title…do you want to let him exploit his authority and manipulate our domains?" The Goddess of Justice asked with a frown.
The only reason they plotted against the Death God was because they were fed up with him using his powers to meddle with their domains, and no one stopping him. He was backed up by the Allfather, after all.