Summon: Blue Roan

Summon: Blue Roan is a skill that allows the summoning of a ride-able Blue Roan mount which runs at a movement speed of 255.

Source
The Blue Roan is learn-able via which is presently obtainable via purchasing the Standard Edition of TERA: The Exiled Realm of Arborea through Best Buy. Prior to this, the mount was an exclusive pre-order bonus from select stores.