White Man

A white man descended from the sky. He didn't appear aggressive. One aggressive member of the superhero group, ignoring orders, decided to attack him. The white man instantly split him in two with a single move. Upon this, the entire group began attacking, resulting in the white man creating a cosmic explosion. Everyone on the scene died, and the explosion site was left as a perfectly formed, orb-like mark. The white man emerged unharmed and never attacked anyone again afterward.