Jhachalkhyn

Jhachalkhyn was a drow city in the Underdark.

Geography
It wasn't very clear where exactly Jhachalkhyn lay but it was far in the south from Menzoberranzan but not as far from the City of Spiders as Maeralyn was, in fact it was so near that it was considered reasonable to assume that refugees from the city would flee to Menzoberranzan, once it was destroyed.

History
At some point around 1136 DR, Jhachalkhyn was infiltrated by the Jaezred Chaulssin, who posed as minor nobility.

Some time around 1360 DR, Jhachalkhyn was destroyed by another drow city called Maeralyn. Its citizens were assumed to flee towards Menzoberranzan.

Despite the destruction and defeat at an enemy's hand, Jhachalkhyn's political system and infrastructure proved to be rather resilient. It was still ruled by Lolth's matriarchy and had a functional merchant class.

During the Silence of Lolth, Jhachalkhyn's matriarchy lost its spells. The loss of power was exploited by the Jaezred Chaulssin fosterage under Xorthaul Barriath in the form of a streak of assassinations. This caused a shift in political power from the matriarchy to the merchant class who then became the assassins' guild sponsors.

After the Spellplague, the city was practically ruled by the Jaezred Chaulssin.