Olrog was a mercenary who was surprisingly cunning and intelligent for an Orruck. He earned the title Iron’ead by his tendency to head butt rivals into submission. During his early years he recruited his lieutenant Bolg to his cause. Bolg has remained with Olrog throughout his many campaigns, serving him faithfully and acting on his behalf when needed.
Olrog became the Prophet of the Waaagh by sacrificing an Aelf Mage following the Realm Hoppers crisis. But Olrog knew he was destined for more power.