Runequest - RuneMasters

From the back cover:

Here are 45 Rune Lords, Rune Priests, and Rune Lord-Priests of the 15 cults surveyed in Cults of Prax. Each Character is completely individualized, experienced, equipped with spells, treasures, bound spirits, and so on.

But William R. Keyes' book is much more than a collection of statistics. He also discusses how Rune Masters should be created and about the logic of their growth, how each type of RuneMaster should be played, what their retinue (if any) should be, how a referee can organize his NPCs with coherent melee tactics and team strategy, etc.