A brotherhood of steel paladin escapes from the battlefield of Helios One, not being caught by the NCR and not knowing where the brotherhood could have possibly gone. She walks all the way to New Canaan and learns mormonism. Then she sees New Canaan get destroyed. Her militant brotherhood doctrine combines with mormonism to create a new religion about crusading. She uses medieval crusader iconography on her new outfits and sets out to Oregon for some reason to conquer religious cities. Besides being a Joshua Graham rip off and having irrational events in general, this one is the most plausible lore wise.