The Gateway Bestiary
Product Code: TBC
Author: Sandy Petersen
Artist: Rick Becker
Giant Anthropods, Legendary Beings, Celtic Horrors, H.P. Lovecraft Creations, Natural Animals, Dinosaurs, Miscellaneous Types
Subtitled : Additional monsters for Runequst (sic). The first appearance of Lovecraftian monsters by Sandy Petersen, under the heading : H.P. Lovecraft Creations (pp. 32-38). Detailing: Deep Ones, Great Race, Mi-Gos, Nightgaunts, Old Ones, Shoggoths, Spawn of Yog-Sothoth.
Release in June 1980. There was also an advertised and unpublished Gateway Bestiary II.