The Magister is an accessory for the Forgotten Realms campaign setting of the first edition Advanced Dungeons & Dragons fantasy role-playing game.

[2] Elminster, a fictional wizard, narrates the book, presenting detailed descriptions and history, in addition to game mechanics for magic.

[3] The 64-page book includes a one-page foreword and introduction by Ed Greenwood, which outlines the subject of the book—new spells and magic items—and cites Pages From The Mages, a series of articles from Dragon magazine in which some of the content had previously appeared.

[3] He wrote that the style of presentation in The Magister is similar to that of the magical tomes of the original Forgotten Realms Campaign Set—"one of the best features of that product.

[3] Regarding the new magical items, he called them "useful and are not simply handy power tools for popping open monsters.