Fate/Zero 2nd Season

Synopsis

Kayneth visits Risei and asks for his reward for Lancer's role in defeating Caster. Risei agrees to reward Kayneth with a Command Seal, but after receiving it, Kayneth immediately shoots and kills him to ensure that no other Masters can get one. During the battle at the Mion River, Maiya finds Sola-Ui and cuts off the arm bearing her Command Seals, then kidnaps her. Kayneth scolds Lancer for not protecting Sola-Ui and mocks him. Saber and Iri, tipped off by Kiritsugu, arrive at Kayneth's hideout, where Saber and Lancer decide the time is right to finish their duel. Kiritsugu confronts Kayneth and, holding Sola-Ui at gunpoint, gives Kayneth a contract of geas that will prevent Kiritsugu from killing him and Sola-Ui if he uses his last Command Seal to force Lancer to commit suicide. Desperate, Kayneth agrees to the deal, causing Lancer to curse everyone around him, especially Saber, before he dies, impaled on his own lance. But the contract only binds Kiritsugu from harming them personally, and immediately after Maiya shoots Kayneth and Sola-Ui. As Saber ends Kayneth's suffering, she confronts Kiritsugu for the terrible and dishonorable things he would do to win the grail. Kiritsugu counters that there is nothing honorable about chivalry, as all war is hell, and he will do anything, including great evil, to realize his wish to save the world. As Kiritsugu leaves with Maiya, Iri collapses from exhaustion.

(Source: Wikipedia)