The old 1e D&D Conan (Conan Unchained! and Conan Against Darkness!) and Red Sonja (Red Sonja Unconquered) modules had some world information for the Hyborean age. There were no demi-humans, it had arcane and divine magic, though it was rare and feared and plenty of monsters. They also had some interesting optional rules, fear checks, luck points and an increased healing rate to make up for rarity of clerics.