The Great Library of Oros
There were few in the later days of Valyria who yet recalled that there had once been a greater breed of dragons than those who flew through the skies between the Fourteen Fires, ones possessed of sorcery and inhuman cunning, ones with a lust for power and gold. Fewer still would have known that some of those Elder Wyrms treasured not glittering gold, but a treasure much more precious by far. The greatest of these was Orocalys the Wise, who boasted that his collection bespoke of 'all under heaven'.
Like all the Great Dragons who sired the Freehold, he too was cast down, his children Meraxes and Syrax together shattered his thrall armies and broke his wards. Though a wyrm cornered in his lair could have wrought terrible ruin with his dying breath, Orocalys agreed to surrender himself to the rebels and to his own death at the last, on the condition that his collection would be preserved and added to in the ages to come, and that his name would be remembered and so it was that Oros alone of all the great cities that bloomed after the Wyrmfall bore the name of one of the Masters. Scholars and sorcerers, sages and spirits, all added to the Great Library, as one was required to bring a tithe of lore to be allowed beyond the silvered gates.
In time the precise identity of he who had laid the seeds of the great trove of lore was lost, but by the memories of gods and the works of their priests, Orocalys's own name was recalled and honored among the bustling streets surrounding the library like spokes on a wheel. Whispers in the darker quarters, away from the ears of the inquisitors of Balerion, spoke of a stranger history, of a great demon by that name chained beneath the earth at the heart of the complex, and some there were who worked strange and secret rituals to he whom they called the Maker and Master of Oros.
The Keepers of the Seven Seals, guardians and custodians of the library, scoffed at such a notion. The only thing at the heart of the library was the vault. Holding only the texts deemed most vital and precious, it had been constructed and warded to last 'even unto the ending of the world'. Perhaps its builders considered it mere hyperbole, but then their world ended in fire they could not master, and in the heart of the the Vault in the heart of Oros...
An old heart beat again to the ears of dying gods.
Fair Oros was a port in the days of old, drawing visitors not only from Valyria and her colonies but from as far a field as Yin and Asshai, but now much of the city has collapsed into the waters of the Smoking Sea, including all public entrances to the library, leaving the would be explorer the choice of carving their war through the cursed stone, or taking the narrow secret paths of those who would enter the vaults untroubled by the masses of petitioners. Unfortunately, these paths were designed for secrecy and not convenience, and in the days since the Doom all manner of mutated arcane horrors have come to nest here.
Worse still, they seem to be acting with a purpose.
OOC: Having the former goddess of prophecy and magic telling you where to loot leads to more detailed reports than you might otherwise have. Not yet edited.