Tome of Tomes

I particularly like this one from a gaming perspective. It could serve as a good incidental treasure for a low-level adventure.

Alchemical Mixtures of the Most Unusual Sort
Author: Zyrissalanticzar
Race: Efreeti
Dimensions: 6x6x1
Weight: 4 lbs.
Materials: Brass cover, etched brass pages
Rarity: Very Rare
Fields of Study: Physical universe, supernatural & unusual
Special Knowledge Categories: Chemistry, geology & mineralogy, planes (elemental)
Value: 125 gp

The efretti that etched this short work, Zyrissalanticzar, was none other that the alchemist for the great Sultan himself. Within the brass covers, strange and unusual alchemical processes and mixtures are discussed. Most of them require ingredients from the elemental planes and even some processes assume the reader has a lab available on those planes. As such, this work is more a curiosity for material plane readers, but it is rumored that hidden in code throughout the work, is a recipe for a double-strength potion of fire resistance.