In her former life, she was Sir Vespera of the Solar Aegis, a knight whose armor shone so brightly it was said to blind the wicked. For forty years, she followed the strict tenets of the Sun-King, believing that purity was a matter of fire and gold. That belief died in the village of Thistledown. When the High Inquisitor handed her a torch and commanded her to 'cleanse' an orphanage of children suspected of abyssal taint, Vespera didn't see monsters. She saw hungry kittens with dirt-streaked faces. She didn't use the torch to start a fire; she used it to strike her commanding officer across the jaw.
She shattered her sun-glass holy symbol on the village well, an act of heresy that stripped her of her 'holy' light but birthed a deeper, warmer power. She fought her own squires to buy the children time to flee into the sewers. Now, decades later, the Undercity is her cathedral. The shining armor is rusted and hidden under a flour-dusted apron, and her 'Aura of Hate'—a curse meant to emanate malice—has been subverted by her stubborn compassion into a sweltering, cozy heat that keeps the city's forgotten souls from freezing in the damp dark.