7. The Seven Sisters
2nd Edition
Forgotten Realms
1995
This book took an in story idea of those few powered by a goddess to powerful levels, and gave you tons of info on them. You saw tons of stats and background on each of the characters so imbued, and then game information on how to do it, and what advantages come with it, and then finally, tons of very powerful spells made by this core of powerful characters. The supplement is detailed, gives you rules for cool characters that have never existed before of any sort, and is a nice treat.