“That’s right. Since the battleground has already been decided, I cannot bring shame to the class of Rider.”

Rider drew the Celtic longsword and raised it high into the sky.

“Appear, my precious horse!”

Accompanying the call, a radiance that pierced through space shone forth from within the torn void. Shining with the light of Heroic Spirits appeared a steed Waver was familiar with.

The hoofed Heroic Spirit horse, Bucephalus. The precious legendary horse that had once carried the King of Conquerors to trample upon the eastern world. Today, it passed through time to return to the side of its ‘ally’. As it sped across the tarred road, it gave a cry of thirst for battle.

- Fate/Zero: Act 15, Part 4