Tome of Ultimate Evil

Wondrous item, artifact (book, requires attunement by a creature of evil alignment)

This evil book is an artifact which grants a 15,000 XP bonus to any evil character who spends 480 hours studying it over a period of 6 weeks, but forces the reader to make a DC 18 Wisdom save. On a failure, the reader is affected as by a geas spell that forces them to attempt to commit suicide, taking as many people with them as they can.

In addition, the book possesses 3 minor beneficial properties, and 1 major beneficial property as well as 2 major detrimental properties, determined by the GM. These properties are permanent and remain even after the book disappears. Any good character who touches the book will sense how putrid and evil it is; if the character then peruses the book’s vile pages, they take 15d6 points of necrotic damage (no save). Once an evil character reads the entire book, the book disappears, going off into the world to spread more misery.