Shinji Matou at Your Service - Chapter 1115: A Good Woman

... classes among Servants. He was already fast by nature, and when combined with specialized acceleration techniques, his speed was nearly comparable to a rocket car in broad daylight.

Of course, a Servant isn't a tireless machine, and moving like this would quickly become unsustainable. But Cú Chulainn didn't care; he continued to push his body to its limits—faster, faster, and faster still.

It wasn't until he was completely exhausted, having drained every last bit of strength, tha ...