Pacifica Casull is God.As the only one unaffected by the Peacemakers' mass-brainwashing powers (that not even an uber-swordsman like Shannon could resist), she has to exhibit some power a level or two higher than Lords Browning and Mauser, even though she doesn't like to fight.
Chris was on Pacifica's side from the beginning.Even during his battle with Shannon in episode 4, he never seems to be deliberately aiming to kill him. One possible reason for this is that fighting inside the cave would do harm to Winia, who at this point had been part of Pacifica's party until Chris had taken her as a hostage. Since he had no one to fight for as a knight until that point, he chose instead to defend Winia, one of Pacifica and Shannon's new friends.
Pacifica couldn't be harmed by the Peacemakers because of her resemblance to Mauser.There's a distinct resemblance, and the Peacemakers were originally the Valkyries, programmed to obey Mauser. The resemblance is probably good enough that it triggers a safety override in the Peacemakers, intended to protect their master. Browning knew of this, and programmed it into the design of the Providence Breaker, so that the Peacemakers would be unable to destroy her.
Towards the end of the war, some humans almost created a spell with a feedback loop which would destroy EarthWhich would be well foreshadowed if this show ever had a prequel.
The final days of the war were fought After the EndThis would explain how all the ruins came about. Perhaps more importantly it would also explain why the war was only fought by about four or five people in the end.
The guardian gene enhances natural abilityThus why Shannon and Raquel are pretty much the strongest and most capable characters in their respective fields. This wasn't stated outright, but is nonetheless likely true.
The aliens exist on a higher plane than humansAgain, never outright stated, but we never see an alien, and they are made out to be much more enlightened than humans, who are said to be unable to understand their true place in the universe.
Pacifica still possesses powers that could bend or strip back realityThus, allowing humanity to ascend to a higher plane of existence.