Located in northeastern Barsaive, Parlainth was the Theran provincial capital before the Scourge. To protect it from the Scourge, Theran magicians moved the city to a hidden pocket of astral space, and removed all knowledge of the city from those left behind.
Unfortunately, Horrors had infiltrated the city before its departure, and the residents of the city found themselves trapped with the very things they had been trying to escape.
After the Scourge, the city was returned to Barsaive, its people dead or twisted by the Horrors into a wide variety of undead creatures. Adventures and treasure hunters travel there and brave the ruins to find magical and mundane treasures the Therans left behind.
The town of Have has sprung up in one corner of the city, providing a relatively safe place for adventurers and those who hope to profit off of them.