Bleucorundum Bluecorundum was a sapphire dragon living under the Omlarandin Mountains near Iltkazar in the Underdark in 1370 DR , who was the self - appointed Sapphire Sentinel of the Sleeping Legion of the Knights of the Crescent Moon . Personality . Bleucorundum was not aggressive by nature but was highly territorial and distrustful of strangers . He was a lover of history , and his language was laced with military and historical jargon . He was strongly dismissive of anyone who had not served in the military and even more so towards pacifists . The most important virtues , in his mind , were duty , honor , and military readiness . His devotion to duty meant that Bleucorundum was lonely . He longed for a mate , but he could not forsake his post guarding the Sleeping Legion , even though he had taken that role upon himself . Bleucorundum followed the dragon deity Null as well as the dwarven god Clangeddin Silverbeard . He also had great respect for Selûne , though he did not worship her directly . In battle , Bleucorundum was a cautious combatant , taking his time to evaluate opponents before going on the offensive . He often relied on the " mirror image " spell to trick his opponents . He was a much better fighter on the ground than in the air , following his sonic breath weapon with physical attacks . He would use his psionic powers to escape a losing battle . Abilities . Bleucorundum could cast the spells , " alarm " , " blessed watchfulness " , " dancing lights " , " dispel magic " , " hold person " , " mirror image " , " neutralize poison " , and " weighty chest " . As a sapphire dragon , he had psionic powers that included " antimagic field " , " continual light " , " passwall " , and " stone shape " effects , as well as the ability to use energy whip s , intellect fortress , mind blank , and psionic blast s . He was skilled in clairsentient and psychoportive powers , such as teleportation . As a sapphire dragon , Bleucorundum was immune to fear and magics that held or paralyzed an opponent . While primarily speaking the sapphire dragon dialect of Draconic , Bleucorundum could readily communicate with any intelligent creature . Possessions . Bleucorundum wore a dwarven fist on his right foreclaw , a spellbattle ring on his left rear claw , and a ring of gargoyles on his right rear claw . On his head , he wore a mithral coronet with a single black sapphire set within . Lair . Bleucorundum had two known lairs . For a long time he lived under the catacombs of the Chapel of the Blooded Moon while guarding the sleeping Knights of the Crescent Moon . When Bryth Moonaxe and his fellows awoke in 1370 , he changed his lair to the Spiderstalking Caverns , where he could eat the favorite prey of sapphire dragons , giant spider s . His lair under the Chapel of the Blooded Moon was more than 70 feet height . Access to the two - roomed cavern chamber was through a 40 - foot tunnel about 20 feet in diameter . This tunnel had trip wires that set off warning bells . The whole lair was under the effects of several " continual light " spells in the floor . In the southwestern corner of his lair was a reflecting pool that enhanced the display of his hoard . Bleucorundum favored sapphire s among other gems and historical artifacts from the region . His bed was composed of between 40 and 50 thousand coins , more than half of which were silver , and primarily of Calishite , Chondath an , and Shanatar an mint . On a display ledge behind his bed were 19 blue sapphires , seven black sapphires , three star sapphire s , and thirteen other jewels . Among other treasures , his hoard also contained the following historical items : Bleucorundum also maintained a backup lair in the Kuldin Peaks , and he possessed a teleport trigger that could take him there in emergencies . Territory . Over the years , Bleucorundum expanded his territory to include regions of Deep Shanatar from beneath Darromar east to the High Peaks and from Impresk Lake south to below the Forest of Mir . History . Bleucorundum guarded the Knights for centuries , first coming to the Omlarandin Mountains in 757 DR . His parents and siblings had been slaughtered by the beholder s who ruled Cortryn ( which later became eastern Amn ) , and he fled through the tunnels of Shanatar to the Omlarandins , where he stumbled upon the Chapel of the Blooded Moon . Through magic , he discovered that the Sleeping Legion still lived . When he learned through research that the Legion had actively fought against beholders in the Eye Tyrant Wars , he vowed to defend them until they awoke again as the prophecy foretold , even beginning to merge his veneration of Null with that of the dwarves ' god Clanggedin .