Extensive Fluff including Descriptions, Lore, Ecology and Adventure Seeds.
Paper Mini designs you can easily cut out and glue together to get on your table quick!
VTT tokens if you prefer to play your oldskool on Roll20, etc.
The stat blocks after modeled after Swords and Wizardry but without Descending Armor Class. The terminology draws upon the gamut of DnD from 5e back to ADnD. As a result, knowledge of other editions will be helpful.