Having grown up in a laboratory, Damian Wayne as a pre-adolescent is left by his mother in the care of his father, who had been unaware of his son's existence. He is violent and self-important and was trained by the League of Assassins, learning to kill at a young age, which troubles the relationship with his father, who refuses to kill. However, the Dark Knight does care for his lost progeny.[6] After the events of Batman R.I.P. and Batman: Battle for the Cowl, he takes the role of Robin at ten years of age,[7] becoming the fifth person to use the Robin persona.