"Always be wary of any helpful item that weighs less than its operating manual." - Terry Pratchett
***
The original version of Fighting Fantasy universe's analogue to the Monstrous Manual, Out of the Pit, had some page-sized full-colour illustrations included, which were excluded in the later 'pocket-sized' edition.
Simon Osborne has kindly scanned in these for those (like myself) who got the cheaper version.
Doragar (Christos Achilleos)
Night Demon (Julek Heller)
Brain Slayer (Terry Oakes)
Fog Devil (Alan Craddock)
Life-Stealer (Ian Miller)
Dracon (Julek Heller)
Dark Elf (Mark Bromley)
Shape Changer (Iain McCaig)
This is "a mirror reversal of the cover of The Forest of Doom"