From the back of the 2nd edition book:
The ancient and esoteric orders of the Shek-Pvar have existed on Melderyn, the Wizard's Isle, and i other locales of Hârn and Lythia for several thousand years, possibly longer. The orders, six in number, are members of the Guild of Arcane Lore.
Shek-Pvar: An extensive, revised, second edition of the basic rules found in Hârnmaster. Comprehensive guidelines are provided for:
Joining the Shek-Pvar
Conducting Spell Research
Spell Casting
Enriched Magic: a section of twenty-nine new and optional rules, dealing with such topics as:
Artifacts and Enchantment
Incancts and Recepticles
Gestures and other Foci
Grey Magic
Grimores and Written Works
Mental Conflict
Research Scheduling
And much, much more
Recommended for all players with the wit and ambition to be real Shek-Pvar.