The Black Knight doorkeeper guards a door during A Void Dance. He is ill from the void leech's foodgoo in the storeroom. He will not allow Korasi or Jessika in without the password and the Black knight access insignia.
After getting both, Korasi, Jessika and the player enter the room, where there is a choice to either bind or kill the doorkeeper. In order to get past him, the player has to steal an Insignia from a worker and get the password by eavesdropping on him using the Void drone. He will ask for a secret handshake although when the player says that there isn't one he admits that he was attempting to trick you.