Ra's al Ghul is one of Batman's oldest and most formidable adversaries, serving as the immortal leader of the League of Assassins. After discovering the life-restoring Lazarus Pits centuries ago, he dedicated himself to preserving the planet by eliminating what he sees as humanity's corruption. His brilliant strategic mind, unmatched swordsmanship, and vast resources make him a global threat. Despite his ruthless methods, he often respects Batman and has even considered him a worthy successor.
