Of the Guidebooks thus far produced, Tome and Blood is the best. WOTC has finally (it appears) to have settled on a format for these guidebooks and the layout is excellent.The prestige classes range from the creative 'Acolyte of the Skin' (who willingly trades their humanity for a diabolic nature) to the Cthulhu inspired Alienist (who bargains with dark forces) to the Marvelous True Necromancer (who brings the Necromancer into their own). The Spell oriented feats are equally well designed and provide for a variety of opportunities and variations as well as allowing casters to tailor their spells to their favored element (Fire, Ice, Sound, etc.).All in all, an excellent book that is (still) unfortunately priced a bit too high.