In the times before time, Garkash was was a Master of Hounds. He roamed the primordial realms as a giant, calling canine beast to his side, hunting all manner of prey. He, himself was to the likeness of the Hound, as he was more beast than divine.
His pack grew strong, and their Master had no tolerance for weakness. They preyed on dragon and mortal alike. Unstoppable in their advances. They reveled in blood sport and after eons of feeding their lust, became one with the rage of battle.
But like all of the divine thrills, his hunger was never truely satiated. His desire for destruction grew with each conquest. His hunt, became a raid. His feast became his addiction. He wanted to expand his conquest into the cosmos, and break free from the limitations and rules.
It was during the Times of Turmoil that Garkash learned of the mythical Seeds of Creation. All the seeds were accounted for, except for the one that was lost. Garkash and his hounds followed the trails that lead him to the Void at the edge of Creation. He plunged into the abyss and was lost to time for an age.
Yet from the emptiness of space, his lust for power and sheer strength of will brought him back to the cosmological substance. He had grown in power. His desires elevated, his strength surpassing the limits of the divine. He bacame what he embodied, the god of War.