Siege of Darkness Siege of Darkness is the third book in the Legacy of the Drow series by R . A . Salvatore . It was later reissued as book nine of the Legend of Drizzt series . Summary . In the first part of the book , the dwarves of Clan Battlehammer in Mithral Hall are preparing to face a drow attack from Menzoberranzan . Drizzt Do ' Urden and Catti - brie are tasked with securing the alliance of the barbarians of Settlestone . Catti - brie has to beat their leader Berkthgar the Bold in a duel in order to convince him . In the meantime in Menzoberranzan the very air seems to whisper of something big to happen . House Baenre is afraid of a conspiracy against them by the other houses ; they fear that they may have lost the favor of Lolth . The svirfneblin of Blingdenstone also feel something in the air . We learn that the Spider Queen fears she might be unable to keep an eye on Menzoberranzan for a time and she asks the demon Errtu to take her place . In the second part of the book , the effects of the Time of Troubles present themselves , with magic going awry . Harkle Harpell fails to teleport himself in Mithral Hall ; Guenhwyvar becomes stuck while traveling between the plane s but is saved by Catti - brie , who destroys the panther ' s statuette . The human woman is later possessed by the sentient sword Khazid ' hea and does not become herself again until Drizzt takes the sword from her . The magical prison holding Gandalug Battlehammer for thousands of years fails . In Menzoberranzan , drow society , based on magic , is in chaos . House Oblodra , a house of psionicist s , is the only house able to retain their powers and so plans a coup . However , the avatar of Lolth appears and suggests an alliance of the greater houses against the Oblodrans , giving them the means to summon Errtu ' s demonic minions to their aid . In the third part of the book , the Time of Troubles ends and magic is restored . The Harpell s reach Mithral Hall , Catti - brie dominates the will of her sentient sword , and Guenhwyvar ' s statuette is repaired . Drizzt and Catti - brie speak about their feelings for each other and decide to be merely friends for the time being . In Menzoberranzan , House Baenre moves against House Oblodra , which is besieged by Errtu ' s demons . Matron Baenre , with the powers given to her by Lolth , gives a great display of strength and sends Matron K ' yorl Odran to the Abyss . That settled , Baenre resumes her planning to attack Mithral Hall . In the fourth part of the book , the drow army marches to Mithral Hall . The svirfneblin of Blingdenstone evacuate their city when the drow pass by and decide to secretly follow the drow in order to aid the dwarves . When the battle begins , the forces of Mithral Hall quickly dispose of the drow slaves ( mostly kobolds and goblins ) , but then the true enemy , the drow , enter the fray . On the surface , Mithral Hall ' s allies from Settlestone , Silverymoon , Longsaddle , and Nesme are in danger of being outmaneuvered and outnumbered by the drow . In the fifth part of the book , the most significant part of the battle for Mithral Hall is fought . The drow , in greater number , drive back the dwarves and their allies both from the lower tunnels and on the surface . The defences hold due to the intervention of Lady Alustriel and the svirfneblin from Blingdenstone , and soon the disloyal drow start deserting . The weapon master Uthegental Armgo is killed by Bidderdoo Harpell , and dawn catches the drow on the surface by surprise . Eventually Drizzt and his companions , hunting for the leaders of the drow , meet Matron Baenre and her party in the deep tunnels . In the ensuing fight , thanks to the indirect intervention of Errtu , Bruenor manages to kill the Matron Mother , avenging the death of Wulfgar . The book ends with celebrations in Mithral Hall , with alliances made stronger . We also witness a happy Lolth handing in an unknown prisoner to Errtu for the demon ' s service : a prisoner who would be the key to Drizzt , the only one who can break Errtu ' s banishment .