Crystal Shards are vicious creatures that travel in groups and only resides in cold shinsu. They appear inside the Hell Express from the 40th Floor onward. A bigger subspecies also exists: the Big Crystal Shards. Their entire body is made full of crystal.
- ↑ Vol.2 Ch.230: 40F - Hell Train: Wangnan (5)
- ↑ Vol.2 Ch.232: 43F - Hell Train: The Floor of Death (1)