Arm’Depping Thireen is a fortress sitting at the base of the Fogwatch Mountain. It is carved out of a black steel that has been impervious to every siege that has threatened it. Though not the official residence of the Baron or his family, it is home to the Baronial Court during the winter months. It is normally occupied by a retinue of guards, standing watch, ready to defend the battlements or sally forth to strike invaders.
Beyond the used rooms of the fortress is a network of underground tunnels that delve deep into the mountain, leading to expansive empty rooms and massive iron walls that are said to entomb beasts and creatures to deadly and dangerous to let free into the world again. These walls have been covered with tapestries, though a few of the original gem studded ornaments still remain.