I've begun the start of the Suneaters background, it tells a very different tale of Gorkamorkas rebellion that has been told to date and is the tale from the Ogors of old, Sigmars "truth" is a lie...

THE SUNEATER TRIBES

Deep within the Realm of Fire the drums of war echo with resounding beats as the fanatical Ogor and Grot acolytes of the violent and fire-born god The Suneater march to war. Putting all that stands in their path to the flame that every realm might one day reflect the broken and charred world that birthed them.

There are many who tell the tales of righteous victories of Sigmar, those that would tell of his heroic deeds and noble intentions to creation a unified pantheon of the gods, all equals in their own right who would form a bulwark agaisnt the tides of chaos that sought to seize upon the Realms. But the words of men are weaved of lies and weighted by the egos of their kind, such tales are little more than the fanciful reimaginings by the poets and politicians of Sigmars realms, their lies woven into the very fibres of every building and the muscled sinews of every Soldiers in his armies.

The terms of Sigmars alliance with Gorkamorka are oft glossed over in the telling of the pantheons founding, such details do not fit the narrative of Sigmars tales and thus who chose to share it with nobody, the feeble Man-God promised the Lord of Destruction a war unlike any other… he told tales of a tide of chaos encroaching upon the realm and a mighty battle to dwarf anything the mighty Orruk god had ever experienced before. The weak god sought to whet the appetite his rival, but where he offered war he hide his desire for a peace without end, when he spoke of battles in glory he wove a leash to keep Gorkamorka to heel, and when he spoke of an empire that spanned corner to corner of the realms he meant only his own. And thus when Sigmar lay the first bricks in the foundation of his grand alliance it was on a crumbling foundation built of lies and deceit, doomed to fail.

To leash the Lord of Destruction is to try and cage the very wind or lid the volcano, for every day that passed for this mighty beasts beneath the heel of Sigmar his temper grew and his patience shortened. Years of enforcing a peace he had never wanted renegated the only glorious creature to little more than the attack dog of the man-god, sent out to wage wars no other god was willing to risk there people for only to return and find yet more idols and cities erected to the weaker gods of the pantheon. As his realisation of this injustice grew Gorkamorka began to unravel the leash he had been caged by, he saw the lesser gods for what they were, false idols feeding off of the belief of their peoples seeking to impose their wills upon the realms that neither asked for nor wanted them. Gorkamorka however was born of the primal winds of the realms themselves, every brick laid tore just a fraction more of that primal wind away, every mighty beast caged fed the other gods and syphoned away his powers. All this while Sigmar thought himself just and glorious, he saw no ill in the cage he had built for the Lord of Destruction, and in his arrogance he failed to see the last threads of his leash unravel until it was too late.

The Gods of Order had thought Gorkamorkas power had diminished beyond reckoning, but the explosive force of his temper caught them all off guard, as the last strands of his leash decayed he erupted forth in a tide of destruction unlike any that had gripped the realms before, he gathered to him every Orruk and Greenskin and those Ogors that would heed the call. It is said by the scholars of Sigmar that every creature of destruction fell beneath the sway of Gorkamorkas petty rebellion, they do not tell of the Ogor tribes that wanted no part of the endless wars that Gorkamorka sought to instigate, but these truths are often found to be inconvinient in light of the war Sigmar waged against Gorkamorkas kin. In retaliation to the tide of destruction Sigmar gathered to him an army of man, aelf and dwarf to enforce his word of Order across the realm, such a combined army marched that the very grass beneath their feed was crushed away to darked dirt, their hunger was so ravenous that they stripped whole regions bare off livestock yet all these things were blamed on the kin of destruction.