The Age of COnan

Whale
Giant Eel, Lamprey,
Sea Horse, Portuguese
Man-o-War, Dolphins
Pungi Ray, Manta Ray
Water Spiders, Weed
Eels
Sahuagin ("Deep
Ones")
Locathah (also "Deep
Ones")
Morkoth
Poisonous Coral
Mashers
Strangle Weed
Creatures from Supplement
III: Eldritch Wizardry
Demons, Type I
through VI, including
Succubi
Mind Flayers (These
are called Spawn of the Outer Dark)
In addition, Geoffrey McKinney has created an excellent Lovecraftian
Dungeons & Dragons supplement entitled Carcosa. Most of the monsters in
that particular booklet are apt for use in a Hyborian Age campaign as well.
Finally, one should not overlook Mongoose Publishing’s excellent Conan
Roleplaying Game sourcebooks. While designed for the 3.5 edition rules,
these books contain excellent ideas and suggestions, as well as rules for
creation of sorcerous abominations and generation of demons from the Outer
Dark; for an enterprising DM, most monsters from later editions are easily
translatable to the original rules—OD&D monsters revolve almost entirely
around hit dice and special abilities.
Unfortunately, at the time of writing this game is out of print and the books are
selling at a premium, but if you get a chance to snatch a few up, particularly
Secrets of Skelos, Bestiary of the Hyborian Age, and Return to the Road of
Kings, these books come highly recommended.
Magical Treasure
Magic items of any type are rare and unique, and almost always serve a
specific purpose—there isn’t a lycanthrope-bane longsword; rather, there is a
set of longswords constructed specifically to deal damage to the lycanthropic
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