Mercy Freddreich was born int a large family in a small rural village on the outskirts of the fortress citadel of Arkham, one of many that supplied the city with grain, vegetables and meats that it required for day to day life. Her family at the time she was born consisted of her parents and two siblings her elders by four and six years, and in the years following her birth the family was joined by three more arrivals, all hands that could aid in tilling the earth and tending to livestock.
One still night in her ninth year, a fierce heat rushed through the countryside and a great tremor shook the earth, crushing trees and upsetting animals in their various barns and pens. When the folk that lived there went to investigate, it was as though a star, still red hot from entering the atmosphere, had fallen from the sky. It didn't take long for a team of scholars from the capital to be dispatched and investigate the meteor, but when they had arrived at the impact crater, the stone formation had cracked apart revealing a hollow interior, and all that lay inside was a shallow puddle of a viscous, oily liquid whose colour was hard to describe and hurt the eys to look at for any length of time. The group conducted their research on the stone, which Mercy observed with great interest, though couldn't quite comprehend the ins and outs of the various processes... though still offered to lift and carry things for them in an effort to be useful, as the thing had come down almot directly upon the Freddreich farmland.
Six months after the star had fallen and the scholars had subsequently abandoned the project after collecting samples of the oil, the harvest festival had begun and provided some strange entries - flora and fauna that had been grown or born from the time of the impact had grown astonishingly large, around twice or more the size they shoud normally be as though some outside force was willing them to grow beyond what they normally could, to spread themselves farther as though a minute bit of butter scraped over a slice of bread, which in turn reflected on their lifespan. Not a week after the festival had concluded did the harvest begin to rot in fields and barns, turning grey and crumbling to dust at a touch, as though whatever had caused the growth had decided to take the gift of life back tenfold, which also reflected in fauna and even some humans who lived nearby the crater, around which nothing had ever grown again in all the time since the meteor had fallen. Their chroma had been stripped as the plants, and each creature had to endure a long, agonising death as their bodies decayed and crumbled while still alive, until either they or their loved ones could stand it no more and simply... Stopped moving.
Curiously, Mercy's parents though they had spent the most time in the fields as whatever supposed poison had seeped into the earth and caused this calamity. One crisp night, similar to the one on which the star had originally fallen, Mercy heard her parents moaning. Not the type which had usually preceded a new member of the family nine months later, but more of a chant similar to those priests in the large halls had used whenever they visited Arkham to sell their crops. The girl crept from her bed and went downstairs, further still into the cellar, a more recent addition to the old family home which had been dug out and stabalised, but had never truely been completed with walls, so that earth and soil were always visible. And that's when she saw it for the first time, an abberant... THING the same colour as the oily liquid that had pooled inside that stone all that time ago, the colour that would now never leave the girl's mind even as she would enter into adulthood. She could hear its whispers in her head, that should its disciples give freely unto it the lives and souls of the pair's offspring, they would be granted existance eternal in its new world and rule over the dead lands as gods.
The creatures that stood before it, ones that Mercy once knew as her parents turned, their faces chalk white and crumbling, their only source of colour those horrible, red eyes. As they stpped forward... the girl fainted.
When she awoke a day or two later, she was in the chapel in the Red Hook district of Arkham. Rumors had reached the city of strange goings on in her village and a group of adventurers had been dispatched to investigate. They had been too late to arrive on the farm before the creature had begun feeding on her soul. When they managed to do away with it and its two wight servants, the little gap that had been left within Mercy had been filled with... well, colour. It took some time, but she was eventually deemed to be safe, should she stay within Red Hook to be trained by the priests and scholars who resided there. Though she wasn't nearly as smart as the other students there, she still studied hard and was eventually able to control the beast within her, and though devoted herself to no deity, continuously planned for any further incursions from the undead such as those monsters her parents had become, or those that could create them.
Which is where she is now, garbed in white and blue, wearing a pair of crystal horns atop her flaxen head to help her focus the fraction of the creature that resides within her into a beam or an axe, or forcing it to give life energy to others rather than take it. Yes, she was now in control of the last portion of the thing, and she could tell, with a wry grin on her face, that it hated every second of it.