This was one of the very first additional magic books available for the d20 game. It has a number of things that would be expected. There are a good number of Prestige Classes for starters and I particularly liked the Blood Witch and the Sea Witch. There are new feats and hundreds of new spells. But the real gem of this book and the reason why it is still good to have today are the ritual casting rules. There was a time that including a copy of these was mandatory in any new d20 book magic it seemed. They were frankly some of the best mutli-caster rules I had seen to that date and I have not seen anything else in the d20 world that has since come close. Throw in scads of magic items and the book is a steal at twice this price really.