The Children Of Perpetua

"children of perpetua" its about the goddess of death (perpetua) being casted out and being imprisoned in the crimson void, but she escapes and then she takes over the body of a human woman who has two kids, Olivia and James. When perpetua takes over her body their souls merge unexpectedly and she gains a sense of humanity and empathy accompanied by the urge to protect these two children, so she decides to awaken their techniques, take them along with her, and train them up to be strong so they can aid her in getting revenge on the gods who casted her out. But as they get older they don't want to aid her in her cause anymore, but something like that isn't easy to leave behind.