Arslan: "If Daryun should be killed by that monster, I swear upon the gods of Pars, I will have your head and that of that monster and hang them from the castle gate!"
The moment after this is the icing on the cake.
Gadhevi: Lord Father, he claims to be the crown prince of Pars, and yet the way he lost his composure... How disgraceful.
King of Sindhura: Ah, Gadhevi, if you were a man who cared for his men even half as much as this prince of Pars does, I would surely have made you the crown prince long ago.
The moment Arslan begins his Rousing Speech to his army to begin the battle of the Keep of Saint Emmanuel (with a determined Yasashuiin!) by the first-third of Episode 24, it unleashes the full might of his troops and his True Companions—all worthy of the series' climax.
The climactic duel between Daryun and Hermes is a surprising match both of swordplay and wits. That it ended with both of them sustaining mutual injuries actually adds to how dangerous these two are.