Rotten Spellbook is a reward from the Class Hall mission Glowing Foundations. It is also a quest reward from Kirin Tor world quests in the Broken Isles, and can be found inside Curious Wyrmtongue Cache.
- Patch 8.0.1 (2018-07-17): This item no longer provides artifact power. Quality changed from uncommon to poor.
- Patch 7.0.3 (2016-07-19): Added.