- This card appears in the artwork of "Dark Contract with the Entities".
- This card is likely based on the Necronomicon, a fictional book from the works of American horror writer H.P. Lovecraft. Among other things, the work contains an account of the Old Ones, their history, and the means for summoning them.
- Fittingly enough, an illustration depicted in the open page of the book in this card's artwork resembles "Old Entity Chthugua".
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