Rider (ライダー, Raidā?) is a Rider-class Servant who appears in the Fuyuki Singularity of Fate/Grand Order -First Order-.
Rider's True Name is Darius III.
Rider was defeated by Saber Alter, and then revived and Blackened. He was later killed by Caster before Mash, Fujimaru, and Olga appeared.