Urthin-Mejin is an Underdark empire that spans across the Tier 1 and Tier 2 subterranean regions of Brucrumus. In Xalyth, Urthin-Mejin's domains cover much of the same territory as the surface empire of Angrod. These two elven nations, one predominantly wood elf and the other drow, have long been adversaries. The hostilities were a continuation of Angrod's conflict with the Eldalweril, culminating in the High Down War from 1285 to 1304. A decade after this clash, Urthin-Mejin moved in and seized the lands of the fallen Eldalweril, including their former capital, Jhaldrym, which now stands as part of Urthin-Mejin's holdings.
In the past, Urthin-Mejin has forged alliances with the dragon cult Vith Alok and the city-state Rumaktharga.