WoW: Forever · Common item
Grimoire of Curse of Tongues is a common book in WoW: Forever with item level 22. It offers requires level 22. Forces the target to speak in Demonic, increasing the casting time of all spells by 50%. Only one Curse per Warlock can be active on any one target. Lasts 30 sec. Vendors buy it for 10s 50c. "Teaches Curse of Tongues (Rank 1)."