Doomsday

The monster who was created for the soul purpose of torturing out and killing Superman, and it did do so, the man of steel only rising again after Batman had killed Doomsday himself, and Supergirl, called to her husband of ancient epoch, having learned his immortal rites, in these powers of his planet krypton, to join him in this impossible struggle, sovereign heroes, there are, of El.

The only other attempt at a superweapon to kill Kalel, has kept success from any others, that they tortured an elder god, and still believe him to be the epitome of their success, Mewtwo.

Batman killed Doomsday in final fatality.