A dark and ominous scene of blood magic being conjured. In the center of a desol

A dark and ominous scene of blood magic being conjured. In the center of a desolate battlefield, a pool of blood begins to pulsate and lift off the ground, forming a floating sphere of deep crimson, almost black, with dark veins extending outward. The surrounding area is lifeless, with the ground cracked and the air thick with the scent of iron. The sphere of blood glows with an eerie red light, casting sinister shadows. The environment around it is darkened, as if the blood is absorbing all light, creating an atmosphere of death and decay.