The crypt thing first appeared in the original first edition Fiend Folio (1981). The crypt thing appeared in second edition for the Greyhawk setting in the Monstrous Compendium Greyhawk Appendix (1990), and is reprinted in the Monstrous Manual (1993). The crypt thing appeared in third edition in Living Greyhawk Journal #5 (March 2002). The crypt thing appeared in the third edition Fiend Folio (2003).