Creator Mark MacKinnon has created an entire book dedicated to BESM Fourth Edition rules variations, extended game mechanics, expanded optional guidelines, creative adventuring elements, and plenty of ready-to-use examples of spells, powers, and items. Along with the BESM core book and BESM Naked, BESM Extras is a foundational pillar for the game line.

This gorgeous volume is 144 full-colour pages with beautiful illustrations from talented artist across the world. BESM Extras features a sturdy hardcover with spot UV lamination, a convenient bookmark ribbon, and a durable Smyth-sewn binding that allows your book to easily lay flat and stay open to any page