Tos ' un Armgo Tos ' un Armgo was the son of Mez ' Barris Armgo and later part of a band of four renegade drow that advised Obould Many - Arrows . Personality . Tos ' un was somewhat uncomfortable with violence . That is perhaps one of the reasons he left Menzoberranzan in the first place , but his sentient sword " Khazid ' hea " often prompted him to take the more violent course of action . History . Early life . In his youth , Tos ' un fought for his house against rival house . During that battle , he was riding a riding lizard when hit a patch of magically slickened floor . The lizard scrabbled and ended up flipping him forwards over its head . He recalled this incident shortly before his death . Renegade . In 1358 DR , Tos ' un participated in Menzoberranzan ' s failed siege of Mithral Hall . In the chaos , he managed to flee to the surface , where he met the drow Ad ' non Kareese , Donnia Soldou , and Kaer ' lic Suun Wett . He joined with them and helped them to aid and advise Obould Many - Arrows in his plan to create the Kingdom of Many - Arrows . All three of his companions were slain ( one by Obould himself and two by Drizzt Do ' Urden ) and Tos ' un was left by himself . Shortly thereafter , Tos ' un found himself wondering about his heritage and whether it was worthwhile . He contemplated life with the surface elves . He was hunted by both Drizzt and the surface elves , who thought that he might have betrayed them to Grguch , Obould ' s adversary . Surface life . After being confronted and confessing his innocence , Tos ' un was allowed to roam free , although the elves kept a watchful eye on him . Tos ' un proved himself and saved a good number of the heroes . After the orc s and people of the Silver Marches made peace , Tos ' un went on to live with the elves of the Moonwood , where he married the moon elf Sinnafain . He lived in the Moonwood with his wife and sired two children , Teirflin and Doum ' wielle Armgo . Early in his life on the surface , Tos ' un was speared in the leg by an orc . The injury never fully healed and he was left with a limp for the rest of his life . Return to the Underdark . When Tos ' un ' s children were older , Tos ' un passed on his magical , sentient sword " Khazid ' hea " , to his children by presenting it as a contest . Doum ' wielle defeated her brother in the contest , but in jealously he attacked her with " Khazid ' hea " . She took the sword from his grasp and killed him at the urging of the sword , then fled in horror and fear . Tos ' un and Sinnafein pursued Doum ' wielle as she fled . They were pursued by orcs until he Tos ' un , having decided he could no longer abide life on the Surface , slashed his wife ' s legs and left her for dead ( although she did in fact survive ) . He caught up with Doum ' wielle and together they traveled through the Underdark to Q ' Xorlarrin in order to rejoin House Barrison Del ' Armgo in Menzoberranzan . However , soon after their arrival , Quenthel assigned Tos ' un to serve as patron of the restored House Do ' Urden prior to her attempted conquest of the Silver Marches . In this position , he , Doum ' wielle , and Ravel Xorlarrin accompanied orc warlord Hartusk throughout the Silver Marches as he supervised his armies . In the War of the Silver Marches ( 1484 – 1485 DR ) , Tos ' un rode the white dragon Aurbangras alongside Tiago Baenre on Arauthator . In 1485 DR , he was killed in battle by the weight and breath of Aurbangras . " Khazid ' hea " , some distance away , felt coldness at Tos ' un ' s death due to having spent decades at his hip . Possessions . Tos ' un fought with two swords . He found and wielded the sword " Khazid ' hea " in 1372 DR . He later passed the sword on to his daughter , Doum ' wielle , but it was given back to him at the order of Quenthel Baenre when he returned to Menzoberranzan . Relationships . Kaer ' lic Suun Wett . Tos ' un was the occasional lover of Kaer ' lic Suun Wett . Sinnafain . Tos ' un was married to Sinnafain for many decades . At one time , he loved her and found joy in their two children , Teirflin and Doum ' wielle . However , he eventually left his wife and attacked her . He publicly claimed that this was because because she could not follow the Spider Queen . Privately , he believed he had loved Sinnafain and he regretted her death , but he saw his relationships with the elves in the Moonwood as ones of survival and convenience . Doum ' wielle Armgo . Tos ' un appeared to care for his daughter , Doum ' wielle Armgo . He called her " my little Doe " and tried to toughen her up to be prepared for life in Menzoberranzan . However , he was also not afraid to manipulate her using " Khazid ' hea " .