From the back cover:
NINE DANGEROUS DEITIES FOR RUNEQUEST ROLE-PLAYING
The bad guys of Glorantha: nine cults of the cruel and unusual, destined to enliven every campaign. Cults include PRIMAL CHAOS, MALLIA, BAGOG, THED, VIVAMORT, THANATAR, THE CRIMSON BAT, KRARSHT, and NYSALOR/GBAJI. Each cult has described cult myths, history, requirements for lay, Initiate, and RuneMaster membership, subservient and associate cults, and miscellaneous notes. There are now Rune spells, battle magics, skills, five new Runes, an expanded cult compatibility chart, full rules for nets, a pronunciation guide, the adventures of Lunar Initiate Paulis Longvale, and exciting mythical and historical essays by Greg Stafford. This book is fully compatible with RuneQuest; the concepts and descriptions in it can be used for any fantasy role-playing system. Similar to Cults of Prax.