The Black Citadel

Again the corridor gradually swings around to the right and you follow it until it ends at a room. The room isn't especially big. Fascinating though alien looking black crystals are suspended in the air through their own power. You can hear the crystals emitting a soft, barley audible hum as you walk closer to them. You cannot fathom their purpose, truly they are unlike anything you've seen before. In the centre of the room is a stone portal.

Do you have the password "zirder"?