Within Hrud society, the Greyfurs have always lived in an oppressive state, being dominated by the whims of their stronger and more aggressive kin. It so happened that in one particular Tribe, certain Blackfurs of high status started dabbling in the mutagenic effects of Warpstones upon living organisms. Despite the seeming moral implications of such an act, using Warpstones to induce forced mutations in other lifeforms is not much of a taboo within Hrud society. After all the direct cause of their genesis as a sentient species is entirely due to exposure to raw Warpstones. The dark experiments of these Blackfurs went largely unnoticed, until an increasing number of disappearances were reported among the Greyfurs. These Blackfurs of like mind banded together into a coven, christening themselves as Moulders, after the act of biological moulding. These Moulders, as they called themselves, deemed the Greyfurs lesser by birth, and thus felt it entirely excusable to experiment exclusively on Greyfurs.

When the Greyfurs finally learnt of the horrific, abominable acts perpetrated by these "Moulders" against their fellow Greyfurs, they were incensed. Open revolt erupted within the entire Tribe as Greyfurs banded together against their former masters. The Greyfurs, carried with the momentum of the times, saw it as the perfect opportunity to overthrow the authority of the Blackfurs and upturn the dominance so unjustly imposed over them through the hierarchical order within the Tribe. This turn of events was known as the Great Revolt. The Greyfurs, taking strength in their numbers, were worked up in an incensed fervour. Though stronger and more adapted to war, the Blackfurs were vastly outnumbered by at least 5-to-1. The Greyfurs proved to be an unstoppable tide that the Blackfurs were helpless to stem, and they quickly lost control of the situation within the Tribe.

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In their desperation, they turned to the Moulders for help, striking a bargain that they may lawfully conduct any manner of experiments as to their whims if only they would restore the authority of the Blackfurs. This dark deal was known to both parties as the Great Pact. The Moulders, scheming and working for their own selfish ends, simply viewed the situation as the perfect means to test their creations. Advancing forth from deep within the subterranean dungeons of the Moulders came shambling huge creatures three times the height of even the largest Blackfurs, and running alongside them, tiny pups that have been twisted into slavering beasts stronger than a Greyfur. The Moulders named their creations collectively as Rats, a humiliating term in their language that roughly translates to "born slave". These Vermin beasts overwhelmed the Greyfurs entirely, as each resistance met was slowly worn down by the waves after waves of mindless beasts. The Greyfurs in their desperation, discovered that the Rats, mindless as they were, were controlled by various Packmasters, who drove them forth through fear of pain. The Greyfurs then prioritised their efforts in taking down the Packmasters, hoping with the collapse of the command structure, the Vermin beasts would lose their will to fight, or even turn against their erstwhile masters. But ultimately it was not to be, for the Packmasters were formidable opponents on their own, and were able to expertly exercised control over the Vermin beasts, forming them around into a living shield.

In the face of inevitable defeat, the remaining Greyfurs were subdued by the Moulders and forced to work as slaves in their laboratories within their dungeons. Once in a while, a Greyfur slave would be selected and dragged into the deepest depths of the dungeons, never to be seen again. No one knows what exactly happens within, but the agonising cries surely reflect the committing of unspeakable horrors. Fear is instilled within the hearts of the Greyfurs, for no one wishes to suffer such a fate, and it is this fear that keeps them in line, repressing any desire for rebellion or freedom. Having settled their end of the bargain, the Moulders demanded that the Tribe be renamed after them. Thus, from that day onwards, Clan Moulder was born.