The Crystal Guardian is part of the miners and a boss of Crystal Peak in the Hollow Knight game. He died from the Infection and was reanimated by it. While encased in the pink crystal, the Guardian shrieks similarly to the Radiance although at a higher pitch. When he gets cleared of the crystal, it has a normal bug voice and has better mastery over the light of crystal than the Crystallised Husks. Hollow Knight cursor with Crystal Guardian.
