From publisher blurb: From the Vaults of the Black Guard Stored within this tome are some of the most valuable techniques and information gathered by the Black Guard to advance their purpose of battling the forces of evil and protecting the weak and innocent from their depredations. Included within: Two Prestige Classes – The Gem Master, men and women who use stones and crystals as mystic batteries and the beast taming Raptor Rider. The Black Guard Cavalier Order Almost 25 Feats including Cavalier and Foster Feats. 3 New Magic Items. Fully Compatible with the d20 system.