Thassarian Thassarian is the first death knight to join the Alliance . As a young man , he joined the Lordaeron army hoping to follow in his father ' s footsteps . Thassarian followed Prince Arthas on his expedition to Northrend , where he was slain and reanimated by the Scourge . He was forced to kill his own mother to prove his loyalty and took part in the scourging of Lordaeron and Quel ' Thalas . One of the few death knights of Acherus who maintained a genuine sense of honor and brotherhood , Thassarian developed a strong bond with the elf Koltira Deathweaver despite being enemies in life , considering themselves brothers in death . During the Battle for Light ' s Hope Chapel , he was freed from the Lich King ' s control along with many other death knights and joined the newly - formed Knights of the Ebon Blade under Highlord Darion Mograine . Thassarian then traveled to Stormwind to serve King Varian and became the first death knight to rejoin the Alliance . He reunited with his sister Leryssa while fighting in the War against the Lich King . After the war , Thassarian remained a loyal soldier to his king while also maintaining his friendship with Koltira , even when they were forced to confront each other during the Battle for Andorhal . Biography . Thassarian was a soldier of Lordaeron during the Third War . He traveled with to Northrend to hunt . When Arthas and went missing , he went to search for them alone . He discovered Frostmourne Cavern , where he found Falric . Falric , already converted to a Death Knight by Arthas , slew Thassarian , and thus began his unlife as a death knight . Thassarian returned to Lordaeron with Arthas and assisted in the massacre of its citizens . Arthas forced him to slay his mother , , to prove his loyalty . This horrific event continued to haunt him , and it remained perhaps his last scrap of humanity for some time . Arthas ' assault on Quel ' thalas introduced Thassarian to the high elves and his brother , , at An ' owyn , where he pursued the mooncrystal to open the second moongate and proceed with their attack . Thassarian nearly killed Faltora , but , upon remembering his mother , he decided to show a moment of mercy . He returned to Arthas with the mooncrystal that he recovered . Koltira later confronted Thassarian and questioned why he didn ' t murder his brother , hoping to convince him to regain his humanity . This attempt failed , and Thassarian killed Koltira , who was returned to unlife as another death knight . Koltira and Thassarian developed a significant friendship that lasts to this day . Years later , the ordered his death knights under the leadership of to attack Light ' s Hope Chapel using the necropolis with the goal of raising the thousand or so Alliance soldiers buried beneath it to bolster the ranks of the Scourge . The attack on Light ' s Hope Chapel ended with a defeat for the Death Knights . Many of the family of the Death Knights were buried at Light ' s Hope Chapel , and the spirits of their relatives rose to convince them to lay down their weapons . Thassarian was convinced by his father , , to stand down . Mograine declared the independence of the Knights of the Ebon Blade . Thassarian traveled to Stormwind and met with who accepted the Knights of Ebon Blade as allies and readmitted its members as members of the Alliance . World of Warcraft . In Wrath of the Lich King . He is first encountered in as a level 55 standing next to and . In phase two after completing , he relocates to the Scarlet Tavern with Bloodbane , where he is involved in the following quests : He shows up at the Battle for Light ' s Hope Chapel as a level 60 elite taking part in . He next appears for all classes at the Wailing Ziggurat in Borean Tundra , where he is involved in the following quests : Thassarian can later be found aboard the Alliance airship the " Skybreaker " above the skies of Icecrown . He is involved in quests that unfold The Shadow Vault among others . He also plays a part in the unfolding storyline of " Wrath of The Lich King " . In Cataclysm . The Alliance and Forsaken are fighting over control of Andorhal and the remaining Scourge presence there . The Alliance , led by Thassarian , have taken control of the western portion of the town while the Forsaken , led by Koltira Deathweaver , have taken control of the eastern portion . Over the course of the Battle for Andorhal Thassarian sends Alliance heroes to deal with the remaining scourge forces and after defeating the leaders , Thassarian and Koltira enter a truce . Some time afterwards Alliance forces launched a failed assault on the Forsaken . During the Forsaken counter attack Thassarian flees and his minion Lurid is killed . With the Battle of Andorhal over , Thassarian heads off to Tirisfal Glades to hunt Sylvanas in an attempt to find out what happened to Koltira . In Legion . Thassarian returns in Legion as the Death knight player ' s first Champion , and he sets you on the course to return the four horsemen to serve you . Manga . " Death Knight " , a manga from TokyoPop , tells the story of Thassarian . The manga was released in December 2009 . Speak , Lich ! Undeath won ' t save you from what I ' ll put you through !