Sleipnir

is a giant eight-legged horse that Doronach uses as his mount.

History
Sleipnir was at some point given to Doronach by Arthur Pendragon to serve as his mount.

Dalflare Range arc
Sleipnir is along the Dark Talismans as they pursuit Percival's group.

Entangled Forest arc
Sleipnir carries Doronach and Burgie flying through the Entangled Forest behind Percival and his companions.

Fiddich later tries to ride away on it, but they are both annihilated by Lancelot's Shining Road.

Abilities/Equipment
Sleipnir is able to gallop over any terrain, being land or sea or air.

Trivia

 * Sleipnir is a direct reference to, the eight-legged horse ridden by Odin in Norse mythology.