21. Al Sah-Him

Complete story — includes the ending

Oliver begins his training, which includes breaking down his psyche so that his allegiance is only to the League and his new identity as Al Sah-him. Ra's recounts the moment that he was chosen to become the leader of the League, a duel with his best friend Damien Darhk who saw himself as the heir. Ra's hesitated and Damien fled, stealing water from the Lazarus Pit and starting his own group. Damien is revealed to have hired Gholem Qadir and Mark Shaw. Subsequently, Oliver is directed to murder Nyssa. Oliver and the League come to Starling City, where team Arrow announce their protection of Nyssa. Oliver kidnaps Lyla to force the group to give her up. At the exchange, a fight breaks out and Nyssa is taken by the League. Oliver almost kills Diggle, but Thea, in her own suit, arrives and stops him. Felicity tells Thea that Roy is alive. In Nanda Parbat, Ra's orders Nyssa marry Oliver and Oliver use the Alpha/Omega virus to cleanse Starling City as a final act of commitment. In flashbacks, the vaccinated Oliver, Maseo, and Tatsu watch as the citizens of Hong Kong, including Akio, become infected.