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Unfortunately, most players I knew owned a copy, and it made it sometimes difficult to pull surprises - as a DM, I’d often describe a creature’s appearance if I didn’t expect the low level characters had encountered one, but sometimes a player would still recognize it. With over 350 monsters to choose from, there was always an opportunity to introduce players to a new nasty. My players usually dreaded seeing me pull the thin book out because it usually signified a special monster encounter versus one of the more common types (skeleton, orc, kobold, etc.) with easy to remember statistics. Released in 1977, the AD&D Monster Manual was one of the most recognizable RPG books with two-thirds of its front cover filled with a red dragon, a unicorn and centaur… and even stranger creatures in the subterranean realm making up the lower third of the front cover.
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