In the God Era, one of the forces serving under the Covenant general Naraz-Nâru, was the Mîmêk Army. In the Demon Spawn War (8972 GE - 9493 GE), this army carried out operations across Unaraggumak and other subterranean regions.
With the Angelic Departure (9494 GE - 9500 GE), the Mîmêk abandoned their old posts in the Underdark, following old war tunnels upwards to the Maziggandîm Region. In 9494 GE, in the valley of Tazundurka they founded Tarband-Khâl.
In 348 LE, the Mîmêk came into contact with the Lith-Crillion. Both had an interest in a very special area north of Tarband-Khâl. The area of interest, the ancient edifice Nemexus, was territory of Tarband-Khâl; and something they did not want to share with the Lith-Crillion. Diplomacy failing, the Maziggandîm Conflict (348 LE - 355 LE) followed.
Yearning for the depths, something draws me there, my family, and friends have all left, a city of 30,000, only a handful of us left. The rest are in Unaraggumak. A number of holdings and settlements are spreading outward from Dushinbal.
It is not diabolical whispers, but an inner yearning like hunger or thirst that draws me to join my brothers in Unaraggumak's black reaches.
- rune tablet found at Tarband-Khâl
The growing might of their Lith-Crillion adversaries, coupled with diabolic influences coming out of Munarkûn, led to the abandonment of their surface holds. The Mîmêk descended into the dark reaches of Unaraggumak, heading for deep mining towns and holds that had traditionally been only populated by those on rotation. In the darkness of Unaraggumak, a millennia of diabolic influence followed. Agents of Baalzebul, spreading the word of their masters, the beginnings of worship. Diabolic pacts irrevocably change the Mîmêk, once Turkûn, they gradually became a new dwarven sub-race called the Duergar. From Turkûn to Duergar, they became leaner, their skin and hair turned dull gray like the stone around them. Some lost all their hair, others saw it replaced spiny quills. Diabolically tainted, they saw improved stealth and alertness, spell-like abilities, and an immunity to paralysis, phantasms, and some poisons.
Most of the Duergar of the world Bal-Kriav are descendants of the Mîmêk Army, and go by the more specific name for their people, the Mîmêk. From the lands of Khelan, Mîmêk have spread to distant lands by way of the Earth Seam.