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ETA: 2026-06-15

Volume 1 of the BX Advanced Bestiary takes the monster entries A-D from the OSE Basic book (link opens in new tab/window) and expands them with options, added details, use for monster parts, additional monsters, and playable classes based upon the same theme. Each entry is illustrated.

It includes rules for monster and animal training, several new race-as-class options (advanced cave locust, changeling, cyclopskin, dragonborn, and genasi), and tables showing the monsters organized by HD, terrain, and type.