The Black Knights' Fortress is a castle inhabited by black knights and fortress guards. The fortress is first entered during the Black Knights' Fortress quest and again during the King's Ransom quest. There is an altar to Zamorak located on the 1st floor[UK]2nd floor[US]. A bronze med helm and an iron chainbody must be equipped to enter or one of the fortress guards will tell you off.
The interior and surrounding areas contain level 20 fortress guards and level 33 black knights who will automatically attack lower-levelled players. Black knights in the meeting room with the large table will always be aggressive to players entering the room and disturbing their meeting.
The meeting hall and the witch's personal chamber.