Grayguard Castle is the bastion fortress guarding the entrance to Cassomir's harbour. Its high walls and towers bristle with catapults, ballistas, and trebuchets ready to release hell to any enemy ship. It is constructed atop an outcropping of rock jutting from Blackwood Swamp and it is the highest point in Cassomir. Only a single road winds up to the gates of the castle. There was once a huge temple to Aroden, situated within the castle, but now it is transformed to a multi-faith temple. A small clerical school in the temple, trains healers for duty on Taldan ships. Grayguard Castle is home to Governor Bozbeyli, administrator of Cassomir Prefecture. and the official residence of the Grand Prince when he visits the city.