Sure. When you rescued Perry, he gave you a key. That key is to a building on the left hand side of the entrance to the Sanguinade (where the red beams are).
Go into this building and use the portal and you'll have a nice long dungeon with a boss battle (Gothraul).
The place where you battle the boss has the last crystal receptor off to the right when you enter.
You missed a blade, however.
After you killed Maulgak in Shiverbane, you go back to the place where the floor collapsed, landing you in prison. The floor's fixed now, and you can cross it into a room with the Ice Blade.