Fus Roh Dah

During the early days of outbreak, the undead had a virus on their brain.  The virus works by attempting to reanimate the dead body cells and re-enabling the brain activity, giving the virus the ability to revive the dead corpse. Unfortunately the virus, often called as z virus, could not work on the emoctions and other crucical parts of the brain, so the undead is mindlessly, out-of-knowing. Due to that fact, the virus kept self-mutating over the days, often buffing muscles, developing bodyparts, increasing hunger will, and so the list goes.

There was a survivor called Ben. Ben Karl. It is told that he experienced a normal life before the outbreak started to create havok upon our world called Earth. Legends says he was been bitten by a ordinary zombie, and didn't get infected by unknown reasons. But rumors says he got the virus inside his body, which mutated his vocal chords.

When he gets enraged, this virus bursts the vocal chords into deafening unhuman chords, giving him the power to say his favorite phrase and launch all objects and living beings into orbit.

Is it not known if victims of his special ability survived next to his scream.