Bellerophon

Bellerophon is one of three Noble Phantasms possessed by the Servant Rider. Bellerophon manifests itself as a golden harness and saddle, effective only when fastened around Rider's mount, the mythical winged horse Pegasus. When used in conjunction with Bellerophon, all of Pegasus's attributes are increased by one rank. The buffets from Pegasus's wings are capable of generating massive shock waves, which raze infrastructure and lacerate the bodies of living beings. The ability to summon Pegasus, a legendary beast, is considered to rival the powers of the greatest of Noble Phantasms. However, this is one of the innate abilities possessed by Rider due to her deeds as the Heroic Spirit Medusa, and is done independently of Bellerophon. The name of this Noble Phantasm is a reference to Bellerophon, a young prince who tamed the Pegasus borne from Medusa.

Addtional source: Fate/Stay Night game translation v1.0a by Mirror Moon