Spelljammer: Shadow of the Spider Moon is a D20 mini-game presented in Polyhedron issue #151 (also known as Dungeon issue #92). It describes an entire new solar system occupied by spacefaring humans, elves, dwarves, illithids, and other species both benign and malign. It includes rules for playing an interplanetary fantasy D20 game, including new feats, prestige classes, and best of all, spaceships!
Spider Moon Archives
Other Spelljammer Fun Stuff
Errors and Clarifications
All material copyright Andy Collins 2001-2008.