You... should probably try to remember it before the fighting starts, the homunculus advised him. It would be beyond ridiculous if he were to lose the war without ever remembering his one of his own Noble Phantasms' names,

"I suppose... anyway, let's go."

Rider gripped the homunculus' hand firmly and leapt forward. The water in the river tried to intercept them by wrapping around them, but was repulsed by the book with little fanfare.

- Vol 1 Chapter 4