SPELL LAW is now a single mighty tome, including over 2000 spell descriptions for three realms of power, covering 15 character classes; detailed alchemy rules; individual spell attack tables; and rules for the use of magic items a campaign.
Sometimes as a GM you just need some good reference charts for some quick results when the players fail or succeed spectacularly. This is an entire book giving you excellent results from the worst to the best a player can achieve. Well laid out and nicely written these are a GM's best friend. Recommended
Such a wealth of magic spells of every conceivable kind. It takes quite an imagination to come up with all this, so pointy hats off to the creators. I wonder how it all worked during an actual gaming session.