Castle Irlingstar

Castle Irlingstar was a remote and secret prison stronghold in the Thunder Peaks on the eastern border of Cormyr, where the king put traitor noble, murderers and agents of Sembia and Westgate..

History
It was established by Royal Mage Vangerdahast Aeiulvana, that erected the wall spell, and survived the Spellplague. In 1480 DR inside it happened a mysterious murder.