2007 · Kaynak kitap (oyunu geliştirmek için kurallar/seçenekler)

Rule Supplement 1: Mounted Combat

A rules supplement for the d20 System covering mounts and mounted combat. It details flying, burrowing, climbing, swimming, large, small, and intelligent mounts, as well as multiple riders, riding platforms, cavalry maneuvers, warpacks, and contest jousting. The book also expands the Handle Animal and Ride skills, adds new equipment and skill uses, and includes more than 50 feats.