First Tymanther - Unther War The First Tymanther – Unther War was a conflict between the nations of Tymanther and Unther that took place in the Year of the Rune Lords Triumphant , 1487 DR . < ref name = " TDYK / Hardcover - p109 - 115 " > < / ref > History . At some point in 1486 DR , while on the world of Abeir , the god - king Gilgeam contacted the demon lord Graz ' zt and asked him to aid Unther in their war against the genasi forces of Shyr . Graz ' zt provided Gilgeam with an army of demon s to bolster his forces in exchange for powerful Abeiran magic item s . < ref name = " TDYK / Hardcover - p94 , 141 , 310 " > < / ref > On Nightal 15 of 1486 DR , members of the Liberators of the Steel Sky accomplished the impossible and opened a portal to Abeir in the Catacombs of Djerad Thymar , believing they would save the dragonborn inhabitants of that world . < ref name = " AotT / Hardcover - p9 - 11 " > < / ref > However , one of the maurezhi granted to Gilgeam , whose mission was to infiltrate and debilitate the Shyran defenses , < ref name = " TDYK / Hardcover - p32 , 310 " > < / ref > was accidentally sent to Toril through the portal . After killing all members of the Liberators , the maurezhi began to accomplish his mission on Djerad Thymar instead , eventually killing Vanquisher Tarhun on Nightal 25 . < ref name = " AotT / Hardcover - p382 - 385 " > < / ref > The maurezhi was killed by Thymari defenders but , without a Vanquisher , Tymanther was left weakened against a potential invasion . < ref name = " TDYK / Hardcover - p32 " > < / ref > On Nightal 26 , Unther was returned to Toril as part of the Second Sundering , and Gilgeam immediately moved against Tymanther to reclaim the former lands of Unther from the dragonborn . < ref name = " AotT / Hardcover - p420 - 421 " > < / ref > On Nightal 29 , after having recovered the ruins of Unthalass and capturing dragonborn from Thymari homesteads and Lance Defenders scouts to gather enough intelligence about the Thymari defenses , < ref name = " TDYK / Hardcover - p93 - 98 " > < / ref > Gilgeam launched an attack on Djerad Kethendi , officially starting the war against Tymanther . The Kethendan forward regiment was unable to defeat the demon army and was utterly destroyed . During the chaos of the battle , some of the Thymari prisoners , alongside a group of Untherite rebels who opposed Gilgeam , led by a military officer named Namshita , fled from Unthalass to warn the citizens of Djerad Thymar . Without their forward regiment , the Kethendans were forced to retreat to their city , and Gilgeam sent his forces and demons to lay siege to Djerad Kethendi . < ref name = " TDYK / Hardcover - p173 " > < / ref > As the Untherite forces advanced against Djerad Thymar and the Lance Defenders were unable to stop them , Yrjixtilex Kallan was chosen as the interim Vanquisher on Hammer 6 of 1487 DR in order to assemble all of Tymanther ' s military forces , and sent an unified front against Unther . After the new Vanquisher was elected , Namshita asked for political asylum for her and her forces in exchange for intelligence about the Untherite forces . < ref name = " TDYK / Hardcover - p312 " > < / ref > As a preventive measure , members of Clan Shestandeliath used the Breath of Petron to raise an earth barrier around Djerad Thymar to protect the city . On Hammer 10 , the forces of Gilgeam laid siege to Djerad Thymar while the Chosen of the gods Asmodeus and Azuth conducted a ritual on the city in order to make both gods separate entities again . To maintain her position in the Nine Hells , Glasya sent the Malbolgean forces , led by a pit fiend named Khartach , to help the Thymari against the demons , helping the Chosen to accomplish their goal . < ref name = " TDYK / Hardcover - p466 - 468 " > < / ref > As Asmodeus became an individual god by absorbing the divine spark of Nanna - Sin , he resurrected the former Untherite god as an immortal being . Grateful to the dragonborn for having taken care of him after the Spellplague , < ref name = " AotT / Hardcover - p291 - 294 " > < / ref > Nanna - Sin sent one of his servants , a giant dragon turtle , to Djerad Kethendi . The beast destroyed the Untherite navy , allowing the Thymari forces to lift the siege of the port city . < ref name = " TDYK / Hardcover - p475 - 476 " > < / ref > With the devil s and dragonborn joining forces against his demon army , and the threat of the Second Sundering trying to return Tymanther to Abeir ( a process that was stopped by the god Enlil ) , Gilgeam ordered his human forces to retreat to Unthalass . The demon army was completely destroyed , lifting the siege of Djerad Thymar and ending the war with a decisive victory for Tymanther . < ref name = " TDYK / Hardcover - p483 - 484 " > < / ref > Aftermath . After the war ended , Namshita and her rebel forces became Thymari citizens and Vanquisher Kallan allowed them to form their own clan , giving them full rights in Thymari society . < ref name = " TDYK / Hardcover - p313 - 314 - 454 " > < / ref > Although he was defeated , Gilgeam didn ' t relent from his plan to retrieve all of the former lands of Unther . As of 1489 DR , Tymanther and Unther were waging a new war , although the Untherite army was unable to defeat the dragon turtle that protected Djerad Kethendi . Mulhorand had closed its borders with the two countries because of the prolonged war .