It is revealed that Caster has broken the standard rules of the Holy Grail War by summoning her own Servant, Assassin , to guard the Ryuudou Temple.

The seventh episode of , titled "A Reward for the Struggle," is a critical turning point that shifts the focus from external battles to internal ideological conflicts between Shirou Emiya and Archer. Core Conflict: Ideological Clash

This disagreement leads Archer to literally stab Shirou in the back, attempting to kill him to eliminate what he views as a dangerous, naive ideology. Key Servant Encounters