Summon: Velikan Gray

Summon: Velikan Gray is a skill that allows the summoning of a ride-able Velikan Gray mount which runs at a movement speed of 240.

Source
The Velikan Gray is learn-able via which was obtainable via pre–ordering the Standard Edition of TERA: The Exiled Realm of Arborea through local stores. As such, this mount is no longer obtainable.