Marsh of Chelimber The Marsh of Chelimber is a swamp located in the Western Heartlands near Evereska . Geography . The swamp is bordered on the north by the Greypeak Mountains , and on the east by the Greycloak Hills . Several tributaries of the the Winding Water are either sourced or fed from this marsh . Description . The marsh had pungent sulphur steam pools . History . In 993 DR , this land was the Principality of the Snarling Boar , the demesne of Prince Chelimber . A wizard known only as the Wizard of the Crag had recently raised a tower in his land . Chelimber tried ousting the wizard with swords , but the wizard turned his men to stone and sent fireballs into the Prince ' s keep . Chelimber then hired a wizard of his own - - Taskor the Terrible . On Midsummer ' s Eve the wizards matched their Art . Both wizards vanished from the Realms , and have not been seen since . The crag upon which the enigmatic wizard built his keep was shattered , and the water elemental s he kept were loosed . Their depredations subsequently flooded the land and slew the Prince himself . After being chased into the marsh , Eldrith the Betrayer united the lizardfolk of the marsh under her rule . She then built the Onyx Tower in the middle of the marsh . When Eldrith was killed , the tower fell and the marsh was put under vampiric rule . The vampire s rebuilt the Onyx Tower only to have it fall again with the death of the vampire lord , Mordoc SeLanmere . However , the death of the Betrayer also resulted in some catastrophic changes in the marshes . The marsh was given to the Zhentarim by the treacherous lizardfolk . While some villages sprouted at the north of the swamp , these were either destroyed by the monsters or put under Zhent rule , who controlled the marsh with a cruel hand . In 1497 DR , it was revealed that the Spellplague had weakened Zhentarim rule in the marsh and they no longer ruled over it as they were not able to delegate it , thus they abandoned it . The Black Network still send spies there but the rule now belongs to Najara , a kingdom of naga . Despite the rule of the naga , the lizardfolk are quite prominent in this new kingdom and are the majority of the inhabitants in the marsh are still lizardfolk , undead and minotaur s , they are just in a unified rule with Najara . Inhabitants . The Marsh of Chelimber was home to numerous lizardfolk , bullywug s , and siv s . The Marsh of Chelimber used to be home to an entire human kingdom . When the kingdom was drowned , its people became undead soldiers . Lizardfolk began to inhabit the swamp and became masters of the undead . The various temples within the marsh house the minotaurs , allies of the lizardfolk who guard the pathway to the Betrayer with the aid of bulette s . Locations . Ruins . The Marsh of Chelimber houses many ruins in it . Many of them originally belonged to Prince Chelimber . The Onyx Tower . The Onyx Tower was a huge tower that housed the soul of Eldrith the Betrayer , which would fall when she died . The Onyx Tower vanished forever from the marsh at her death , and reappeared briefly when Mordoc SeLanmere brought it back . However , it was quickly moved to the city of Baldur ' s Gate .