Existing in Helheim, home realm of the heteromorphic races, the Piercing Crystal Plains were a hazardous environment, covered in frozen vegetation that resembled crystal razors.
The crystal razors that covered the area dealt damage with every step taken within the Plains, and they could damage players wearing Relic-class armor. In addition, mineralized monsters wandered through the plains, and anyone who did not use bludgeoning-type weapons would have a hard time dealing with them.
- It was about a 100 meters away from the Grenbera Swamp.
- When questioning Sebas Tian on where the Great Tomb of Nazarick was positioned at after its transfer into the New World, Momonga vaguely asked the butler whether the plains covered in frozen grass deal damage to him the more he cross through it each time.