Changed from Classic: highlighted lines below differ between the two clients.
Classic 1.15.9.69722
Grimoire of Curse of Tongues
Book
Classes: Warlock
Requires Level 22
Use: Teaches Curse of Tongues (Rank 1).
Sell Price: 10s 50c
Forever Beta 1.60.1.70009
Grimoire of Curse of Tongues
Book
Classes: Warlock
Requires Level 22
Use: 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.
"Teaches Curse of Tongues (Rank 1)."
Sell Price: 10s 50c