Earthfast Mountains The Earthfast Mountains , or simply the Earthfasts , were a small mountain range in north Faerûn , running from the Dragon Reach in the west , through the Vast and into Impiltur in the east . It was an arm of the greater Earthspur Mountains to the north . Geographical features . Despite being somewhat smaller than the Earthspur Mountains , the Earthfast Mountains were jagged and only slightly less harsh , and just as hard to cross or climb . The mountains had rocky peaks and steep slopes , and were separated by abrupt gorges . Fortunately , a few passes permitted traffic through the range , connecting the north and south parts of the Vast . In the west , the High Trail ran through Elvenblood Pass , and in the east , the North Road ran through Glorming Pass . One famous but hidden peak in the Earthfasts was Iron Dragon Mountain . The Hill of Tombs was the southernmost point of the mountain range , lying in Impiltur near the coast of the Sea of Fallen Stars . The Fire River originated in these mountains and flowed west through the Vast into the Dragon Reach . Near the source of the Fire River , a cavern in the foothills of the Earthfast Mountains held tunnels that led into the local Underdark , in the area called the Deep Wastes . Another well - known mountain was the Fang in the Forest in the southernmost end of the range . It was a conical - shaped peak and thought to be an extinct volcano . There were deposits of iron , silver , and copper ores to be found within the Earthfast Mountains . In the western end near Ravens Bluff , there were dwarven stone quarries . Locations . Perhaps the most important site in the Earthfast Mountains was the Master ' s Library on Iron Dragon Mountain . It was one of the greatest temples to Deneir in Faerûn and home to the largest library in the world . Its true location was hidden , however , but the Reading Room fortified temple that supported it lay some distance to the south . The mountain was formerly the lair of Ouranalathra the " Mistmaiden " , a great mist dragon . The besieged dwarven city of the same name , Earthfast , was situated in a high mountain valley of the Earthfast Mountains . Malanthus Stormstaern , a Magister , once possessed a keep hidden in the Earthfast Mountains , somewhere near the headwaters of the Fire River . This was thought to be buried in an avalanche and lost to explorers . There were two small settlements in the western Earthfasts , High Haspur and Sarbreenar . Inhabitants . The highest peaks of the Earthfast Mountains were dominated by various avian creatures , including giant eagle s . Their depths , meanwhile , were occupied by large populations of orc s and ogre s . Other parts were inhabited by goblinoid communities , with goblin s and bugbear s , as well as some lairs of hobgoblin s from the Gray Forest . They followed the goblin gods Hruggek and Maglubiyet . Finally , drow could be found within and beneath the mountains . There were barbarians dwelling in the Earthfast Mountains . One god their cleric s worshiped was Isakkhu , a mountain god . Shield dwarves also dwelled in the Earthfast Mountains , particularly around the besieged city of the same name , Earthfast . The Master ' s Library temple of Deneir was home to Deneirrath priests , particularly the High Librarians of the clergy , but all devout followers of Deneir were expected to make at least one pilgrimage to here . The Deneirrath were aided and defended by eight full - grown mist dragon s who laired in nearby peaks . Ouranalathra the " Mistmaiden " , a legendary mist dragon , also once laired here at Iron Dragon Mountain . The Rocktappers were a loose association of prospectors , trappers , and hermits who roamed the Earthfasts . The Fang in the Forest mountain was home to the green dragon Aglaraerose , from the late 14th century onwards . History . The Magister Malanthus Stormstaern occasionally operated from a hidden keep in the Earthfast Mountains during his reign , from 154 DR to 177 DR . The famous mist dragon Ouranalathra the " Mistmaiden " once kept a lair in the range , from which she battled several other dragons during the Year of the Mist Dragon , 231 DR . The mountain where she laired later became known as Iron Dragon Mountain , and after she left it became the site of the Master ' s Library . Dwarves of the Earthfast Mountains joined the armies of War - Captain Imphras Heltharn of Lyrabar to battle a hobgoblin horde in the High Pass of the Earthspur Mountains . Although mines in the Earthfasts produced moderate quantities of iron and silver , they proved to be insufficient against the poor environmental conditions and hardships faced by the miners . However , in the mid - 1350s DR , prosperous new veins and lodes of iron , silver , and copper ores were discovered in the mountains north of Lyrabar , inspiring prospectors to brave the harsh conditions and hobgoblins , hoping to strike it lucky . These new mines were predicted to fuel the Impilturan economy . By 1359 DR , a few dozen lone and stubborn prospectors were scouring the range , with many more at it by 1372 DR . These included members of the Rocktappers . In the Year of the Prince , 1357 DR , the Harper bard Mestrel Hawkmantle pursued fleeing brigands east up the Fire River towards their hide - out , only to see them captured by slavers instead . He followed them to a cavern in the foothills of the Earthfast Mountains , where he soon found about fifty slaves being traded to drow emerging from the Underdark . Mestrel attacked the drow and the slavers , and freed their captives , leading them out again .