The monks valiantly embarked on a generations-long project of cleansing Urheim of its contagion by venturing deep into its subterranean recesses to confront its denizens with holiness, magic, and steel. As part of their plan, they worked the very stone itself, giving it a Lawful pattern and sanctifying it in the name of St. Gaxyg. Slowly but surely, despite the cost to themselves, the Gray Monks did more than just contain Chaos; they pushed it back, defeating it in its very lair, in the process amassing items of mysterious origins and magical potency, along with other treasures, all of which they either put to good use or stored away, lest they fall into the wrong hands.
While the monastery stood strong, it was a beacon of light in a darkened world. Pilgrims flocked to it in order to venerate the memory of the saint in whose name the monks labored and to gain spiritual edification from their example. Novices regularly entered the monastery, swelling their numbers and ensuring that Law carried the day in the battle beneath Urheim. Many warriors pledged themselves to the monks and joined them in their great task, which further strengthened their cause and led some to believe that the Chaos beneath Urheim might finally be defeated for all time.
Alas, the taint of Chaos touches all things, even a bastion of Law, such as the monastery of St. Gaxyg. After several centuries and a succession of weak abbots, the Gray Monks grew indulgent, preferring wealth and influence to wisdom and piety. Slowly, the blasphemous spawn of Urheim reclaimed the caves as their own, pushing the monks out and reversing the hard-won victories of the centuries. Rather than fight them, as had their predecessors, the monks simply warded the entrance to the underworld and settled into a comfortable laxity. No longer exemplars of law and goodness, the wealth of the monastery aroused the envy of local lords, who eventually sacked it, putting the remaining monks to the sword, and seizing their treasures. Greedy though they were, these lords knew well enough than to disturb Urheim, leaving it safely warded by the holy magic of St. Gaxyg.
Chaos still issues its siren call, drawing evil beings, both human and otherwise, to Urheim. Rumors have spread that someone -- or something -- has found a way to enter the hidden caves once more, seeking both the wealth and evil power they reputedly hold. If true, the darkness the Gray Monks once fought could escape its prison and pour out across the land, heralding a terrible future ...