Seffine is the daughter of Laedes and one of the few surviving Olympians. She has defected to the side of our heroes because of her revulsion at her father’s methods. While she might understand (though not agree with) the reasons of Laedes’ revolt, she opposes his decision to kill or imprison them.
Seffine is the youngest of the Olympians, at just under 500 years old. She has some of the reality-altering abilities of an Olympian, but she is not a First One and has very little power compared to her father.