The Prologue: Fake Black Saber vs Red Saber, unleashing their Noble Phantasms.
Twilight and crimson lightning raced out and crashed into each other. The two streams of light, like surging waves with simply the purpose of destruction, attempted to swallow one another. It was the most unlikely scene possible in the history written by man. It was a clash of two deadly Noble Phantasms, from two heroes who were born in different eras and flourished in different lands. Light filled the space and annihilated everything in the surrounding area. The golems and skeletons crowding around them were overcome and faded into dust.
Everyone who witnessed this majestic, unrelenting scene swallowed their breath. The space filled with Red and orange seemed as though it was declaring the end of the world. However, all stories must have an end. The light that had only swelled began to calm, and disappeared like specks of dust. The ground where the two had stood was a tragic sight to behold.
Imagine a butterfly spreading its wings. Such a mark had been carved into the ground. It was the trace of an explosion, so enormous it could be seen even from far up in the sky. How many would be able to believe that such a trace was left behind by the slash of a sword? It was certain that a new legend had been born today on this land. The impossible clash between the legendary holy sword and the anomalous demonic sword gouged out the earth.
Astolfo saving the Homunculus from death, even fluking out his would-be captors and bringing him to Chiron, who heals him.
Karna's fight with Vlad III was probably the highest-level battle that's occurred so far. Despite abusing his Romanian fame-boost and the Demonic Defender of the State to their extremes, Karna turned out to be simply far too powerful for Vlad III to take on. Even when Karna was impaled from the inside of his body with stakes, he simply responded by incinerating the stakes and continuing the one-sided fight. This fight was basically the sole reason that forced Darnic to utilize all three of his Command Spells to fuse with Vlad III and activate Legend of Dracula.
By the end of the fight, Karna had blocked 1000 stakes with his spear, burned away 800 more and tanked 2000 with his armor.
Vlad III and Darnic's fused form taking on SIX SERVANTS on their own and basically forcing a draw. This is even more amazing when considering the fact that Vlad III had just lost his Romanion fame-boost and the advantages that Demonic Defender of the State brought. There was also the fact that the six Servants in question were being empowered by Jeanne herself.
Mordred and Sieg crumbling Avicebron's Adam with a dual Wave Motion Sword attack in the form of a simultaneous Balmung and Clarent Blood Arthur.