Murced Haas

https://www.deviantart.com/z-crackers/art/Code-370551946

Murced Haas is a cursed man from a world named Tierra. This world was once a peaceful one of mostly humans, with other races like elves and dwarves milling about. The world was a desert, the inhabitants forming in the nicer regions of the planet. They were at war with another planet in their solar system, however. They had spell jammers, crafts of magic, which is how the other world, Hengla, controlled by a shadow faction known as Errabore, found out of Tierra.
Years passed of this cosmic war, the people of Tierra surprisingly winning with their superior knowledge of the arcane, until one day the people of Hengla thought of one plan that could weaken them severely. They gathered wicked witches from their world, forcing them to sacrifice themselves to curse the world of Tierra. It's people were either turned to ash, except for the ones if arcane or divine power and knowledge of any magnitude. Those that survived turned into a race of ashborn as they were later called, those turned to ash but the arcane forces they manipulated held them together.
After this terrible incident, the survivors wanted only to be done with this war after having forever scarred this world's people. Those that didn't adapt quickly enough died, but those that sought a solution to this issue found they could take others life forces to sustain themselves for longer than the year lifespan they were given. Everyone was taught this method, and while unethical, it was used on their livestock to help sustain them.
Wanting to escape this solar system, the most powerful mages, the closest to being fully formed as the people they were, created the biggest spell jammers they could make, and used them to push their planet out of orbit of the double suns they orbited. However, something went wrong. A meteor, unbeknownst to everyone there, passed directly by Tierra, disrupting the gravitational force and flung the planet towards Hengla, sending it on a collision course. The people of Hengla had their own innovations, however, and they were working on an experimental portal themselves that they could use to invade Tierra. But when the planets collided, this malfunctioned and instead of mass death, the people of both planets were flung across many universes, some landing in Faerun, some in Greyhawk, and a few in Daleos..

Murced comes in as a man who was training under a group of monks on Tierra. His parents were off fighting this war, unable to take care of him. The monks that taught Murced taught him a certain fighting style, one to extract and use the life force of others to hurt of heal. He was taught strictly only to use these abilities on who deserves it.
When disaster struck, Murced and the monks were an exception… their powers over ki and life force, despite their disconnection from the weave, allowed them to survive the onslaught, being more put together than the average person, but still converted to these ashborn.
Once Murced had finished his training, he left the monks to pursue other ways to make the most of this life. This was the first time he ever left the monastery, and was shown face first just the kind of destruction that was wrought of his world. He vowed that his abilities were deserving of the enemy world, and sought out to deal with any operatives on his world.