Card Trivia:Umbral Soul
- This monster appears to be based on an eight-legged Basilisk, a legendary monster believed to be able to kill people or turn them to stone with the power of its eyes.
- The word "umbra" is Latin for "ghost" or "shadow", as well as the scientific term for the darkest part of a shadow.
- This monster is the DARK member of the Attribute Reptiles: the others are "Radiant Spirit", "Firestorm Prominence", "Silent Abyss", "Destruction Cyclone", and "Raging Earth".