Beyond the Storm
Brass Keep is the last outpost in the Middle Mountains securely held by the forces of Chaos. An ancient fortress built on a steep cliff edge facing north and west towards Middenheim. Taken during the Storm of Chaos by forces loyal to Khorne, it is a strong rallying point for the enemy that continues to threaten the Empire around and allows the various factions of Chaos to retreat into the mountain fastness to recover.
So far, the Graf of Middenheim and allied forces have not been able to get close to taking this thorn.