Vengeance of the Iron Dwarf Vengeance of the Iron Dwarf is the third and final book of the Companions Codex series by R . A . Salvatore . Summary . The story of the War of the Silver Marches continues with the three dwarven strongholds — Mithral Hall , Citadel Felbarr , and Citadel Adbar — under siege and the cities of Nesmé and Sundabar ( renamed " Hartusk Keep " ) already captured by the forces of the Many - Arrows , aided by frost giants and a number of drow from Menzoberranzan and Q ' Xorlarrin . King Connerad Brawnanvil of Mithral Hall , along with Drizzt Do ' Urden , Bruenor Battlehammer , Catti - brie , and Athrogate have arrived at Citadel Felbarr to discuss the dwarven kingdoms ' next steps . Bruenor , known to the other dwarves as Reginald Roundshield , reveals himself to be the once - king of Mithral Hall reborn . The dwarves and their guests celebrate Bruenor ' s return before the remaining Companions of the Hall and Athrogate return to Mithral Hall . In the Underdark , Regis and Wulfgar , who were separated from their friends at the underground gates of Mithral Hall , are surviving but unable to return to their friends due to the hordes of orcs every which way . They decide to travel east towards Citadel Felbarr , but they must guess which direction east is . In Nesmé , the drow Tiago grows bored with orders from Menzoberranzan to sit quietly in the lands conquered by Many - Arrows . As winter sets in , he takes the white wyrm Arauthator to seal off the chimneys of Mithral Hall . The orcs take his measures a step further by causing avalanches to seal the fortress tight under Fourthpeak . The dwarves sneak out of the mountain , hoping to ambush the besieging orcs , but Drizzt discovers that it is a trap and they all return to their tunnels . Arauthator and his son Aurbangras return to the Spine of the World for the winter . During the winter , the dwarven kingdomes continually try to break out of the grip of Many - Arrows , but fail each time . The elves of the Glimmerwood , led by Sinnafein , see how desperate the dwarves are becoming and plan to aid them . Catti - brie , using her magic to find out how the other kingdoms are doing , learns of the great hunger and suffering of Citadel Adbar and convinces her companions that they must find a way to break the siege . Back in the Underdark , Regis travels down an underground river in search of help for Wulfgar , who has been badly wounded . Regis finds Knight - Commander Aleina Brightlance of the Knights in Silver and refugees from Sundabar . The two companions join the group and journey to the Underdark around Silverymoon , where they chase away the drow and orc forces . They enter the city and solicit aid from Taern Hornblade , the High Mage of Silverymoon . Meanwhile , the Glimmerwood elves are approached by Ambergris and Afafrenfere , who come bearing aid from a mysterious benefactor ( Jarlaxle ) . They are joined by a strange elf named " Mickey " ( Tazmikella ) , who informs them of a plan to free the Silver Marches from the orc oppressors . Mickey takes Sinnafein to Mithral Hall unnoticed , where they include the remaining Companions of the Hall in their plans . A small group of elite warriors with Bruenor Battlehammer escape Mithral Hall and journey onward to free Citadel Adbar and Citadel Felbarr . Bruenor unites the dwarven forces to retake the River Surbrin bridge from the forces of Many - Arrows . In the sky above the battle , Drizzt and Afafrenfere on the copper dragon s Ilnezhara and Tazmikella confront Tiago and Tos ' un Armgo on the white dragons Arauthator and Aurbangras , leaving Tos ' un and Aurbangras dead and Arauthator in retreat . Bruenor then uses the " Ritual of the March " to conquer Dark Arrow Keep , restoring it to Lorgru , its proper ruler , and defeating Hartusk ' s remaining armies . The last thing to remain is the Darkening , the pervasive dark clouds blocking the sun . Drizzt feels as if the might of Mielikki has come upon him and he is able to disperse the darkness . However , unbeknownst to him , it is in fact Gromph Baenre ( at Jarlaxle ' s insistence ) using Drizzt as a vessel for his powerful magic . As the Companions of the Hall come together again , Bruenor sets his eyes on on freeing Gauntlgrym from the drow . Index . Creatures . Copper dragon • Diatryma • Drow • Dwarf • Elf • Frost giant • Goblin • Halfling • Horse • Human • Ogre • Ogrillon • Orc • White dragon • Worg Gnome • Illithid • Rabbit • Riding lizard • Half - orc • Half - ogre Groups . Bregan D ' aerthe • Clan Battlehammer • Clan Karuck • Clan Moonwood • Companions of the Hall • Gutbuster Brigade • House Baenre • House Barrison Del ' Armgo • House Do ' Urden • House Xorlarrin • Knights in Silver • Knights of Everlund • Lady Avelyere ' s Coven • Order of the Yellow Rose • Riders of Nesmé • Ruling Council ( Menzoberrazan ) • Uthgardt tribe • Wilddwarf Brigade House Fey - Branche • House Hunzrin • House Melarn • House Oblodra • House Vandree Spells . " Clairaudience / clairvoyance " • " Dimension door " • " Discern lies " • " Endure elements " • " Fireball " • " Gate " • " Globe of darkness " • " Invisibility " • " Levitate " • " Lightning " • " Magic missile " • " Protection from energy " • " Protection from normal missile " • " Ritual of the March " • Scrying • " Spectral mount " • " Summon fire elemental " • The Darkening Artifacts . " Aegis - fang " • " Cracker and Whacker " ( unnamed ) • " Icingdeath " • " Khazid ' hea " • " Orbbcress " • " Robe of the Archmage " • " Taulmaril " • " Twinkle " • " Vidrinath " Throne of the Dwarf Gods ( Gauntlgrym )