Grithok was once a simple hunter who stumbled upon a small Skaven retinue in the Grey mountains. After slaying the Skaven, Grithok looked for treasures amid the belongings of the rat-men. The leader of the Skaven posessed a spyglass that was strapped to his face. Grithok, took this strange device, the size of a monocle to Grithok, and put it on - only to fall unconcious.
When Grithok awoke he discovered that he had vastly increased intellegence. He began to tinker with the devices of the Skaven, becoming an Orcish Engineer. While he does not truly understand the way that the warpstone glass has affected him, he does not care - it gives him more power to kill and gave him the way to defeat even the Black Orcs and secure his place as Warlord!
One of Grithok's prized creations is the Gyrocopter - seen here with his trusty Hochland Long Rifle, his assitant Goblin GizmoStrype and his faithful hunting lion Cringer.