No one knows much about Grimgor before he staggered out of the Blasted Wastes with the Immortulz, his bloody-minded bodyguard. Even for a Black Orc, Grimgor’s thirst for war was exceptional. If a single day went without battle, Grimgor was known to start camp-decimating arguments, his one good eye blazing with eagerness to find fault and start a good scrap. Two days without battle and Grimgor would smite anything he could reach, save (perhaps) his fellow Black Orcs. No one knows for sure what would happen if three days without a battle occurred, but even unquenchable thirst for battle is a sign that marks out a Warboss for leadership, a sign that that the Orc is favoured by Gork.
Grimgor maintains a tough, elite retinue of Black Orc warriors around him. This is the hard-as-nails mob known as da Immortulz, a moniker earned due to their habit of surviving almost impossible battles. On the whole Grimgor much prefers Black Orcs to any other kind of greenskin, but plenty of weedier types have snuck into his camp when the steely gaze of his single eye is fixed elsewhere. So long as things are going well (which means there are lots of other things to fight against), Grimgor tolerates the company of other Orcs and Goblins, at least as long as they stay out of his sight.
Grimgor has slaughtered his way across the Blasted Wastes to the centre of the Empire and back. Yet after winning many victories, Grimgor returned to Red Eye Mountain. Deep underground, beyond where the Red Eye Night Goblins dwell, the endless hordes of Skaven can be found. Here, for a time, Grimgor can appease his need for daily butchery- for the ratmen feed uncountable numbers into the fray solely to occupy Grimgor’s fury.
Yet eventually Grimgor will grow weary, striking out again in search of a worthier challenge- and when he does so, the world will tremble with fear, each nation praying that Grimgor won’t head in their direction