Soul stain

In a world where murderers and serial killers are commonplace and death is very rarely taken seriously, in a world where if you killed someone their blood stains your soul red and if you gain enough stains you'll become a demon with incredible powers, you are a serial killer going for your next prey when all the sudden someone with a powerful angelic sniper shoots at you, be able to choose your name your appearance your personality, and any abilities you want, you gain one unique ability, a weapon that is your soul weapon combined to your soul, super strength super speed increased intelligence, regeneration increase durability,