Candlekeep

Candlekeep's immense walls and fortress-like design protected countless invaluable tomes, gathered from across the realms. During the Night of Fire, Candlekeep was already under siege by the Shade Army. The city's fortifications spared its citizens from the worst of the dragonkin's rampage, but the great library was not so fortunate. The dread wyrm Draxxis arrived after destroying Baldur's Gate and used his breath to scorch the massive structure. The library's monks, the Avowed, were able to prevent the fire from spreading throughout the entire building, but all the tomes stored on the top floor were lost to the conflagration. Try as they might, the monks could not extinguish the remaining flames, which burned like hellfire. Just as all hope of saving the city was lost, an unknown dragonslayer stepped forward, and from their bow they fired a single arrow. The arrow turned to a beam of light midflight and pierced the long axis of the mighty dragon, killing it instantly. Draxxis crashed down onto the northern wall surrounding the library, his body sprawled across the battlements. It was then that the monks battling the flames within the library heard a strange noise coming from the flames, as though a terrible roar heard from a great distance. The soul of Draxxis had become bound within his unyielding breath, and the monks hurried to seal the flame and lock the monster's essence within.

It is said in hushed tones across the streets that Ulraunt, the leader of the Avowed, made a bargain with Draxxis, promising to free him from this arcane prison after he has recounted all the knowledge he has acquired during his long years. Many believe the monks commune daily with the dragon's soul, teasing out unfulfilled prophecies and lost secrets. As for Draxxis' body, his scales were harvested for armor, his blood for arcane rituals, and any number of uses were found for the rest of his flesh. All that remains of his physical form are his immense bones, which still remain aloft the walls of the library.