Principles of Thaumaturgic Transmogrification

Principles of Thaumaturgic Transmogrification was a book on magic found in Faerûn in the late 15 century DR, but known to be ancient.

A copy was in the library of Bradda's Sage's Shop in Neverwinter; this one had notes scrawled in the margins. When Elminster visited the city in 1479 DR for the Protector's Jubilee, he asked an adventurer to covertly transcribe the notes on page 238 for him.