I'm from another world. In that world, there are powerful monsters called 'Withers', which are basically giant flying three-headed skeletons, stained black with decay. I was known as one of the greatest warriors of my world One day, a bizarre incident caused me to become part Wither, and I was cast out by my people. Disguising my gruesome disfigurement, I've been traversing the great expanse of Reality ever since.
Ever since that day, I've possessed great necrotic powers, even being able to summon and control the dead, or spread decay over vast lands with a single touch.