While many scholars know of Nybor because of certain unique spells bearing her name, little is known about the woman herself. Nybor rose through the ranks of the Red Wizards to be zulkir of enchantment, and gained that exalted position at an unprecedented young age through a combination of factors, including assassination, spying, and manipulation of lovers.
Most Red Wizards hoard their magic, jealously keeping their work to themselves. Nybor freely gave her spells to many traveling Red Wizards. As a result her name and work has come down to us.
Nybor's Simple Codex is the only book of hers that has ever been known to leave Thay, and contains an assortment of the spells which bear Nybor’s name, as well as spells exclusive to the Red Wizards of Thay. Study them, pick them apart, but for the gods’ sake don’t use them, for there is reason to believe that Red Wizards have ways of knowing when their spells are used by anyone not previously authorized by them.
- from the publisher's blurb