Yugoloth Favor Potions

Upon reaching the Unfriendly (75) Yugoloth Favor, you can view and purchase Essence Potions by visiting an NPC called Azdaf the Wary (Yugoloth Alchemist) in Amrath. These potions stack, up to 100 for each of 6 different types. Each potion grants a buff to a stat and a unique extra bonus, but comes with an additional penalty. They last 15 minutes.