This article is about the 1st edition sourcebook. For the 3.5 edition sourcebook, see Unearthed Arcana.
"...All the new discoveries, plus a wealth of just uncovered secrets, between one pair of covers."
This, the latest of the AD&D game books, further defines and describes the game system. Inside are new spells, character classes, magic items, weapons, and much more for both players and Dungeon Masters.