Rune of Forbidden Knowledge
UncommonConsumableItem level 40Requires level 1
Usable by 
“Teaches you a new Engraving ability.”
Rune of Forbidden Knowledge
Binds when picked up
Unique
Classes: Warlock
Requires Level 1
Teaches Engrave Boots - Demonic Knowledge: Engrave your boots with the Demonic Knowledge rune: Increases your spell damage and your Demon pet's spell damage by up to 100% of your level while you have a summoned Demon pet active.
“Teaches you a new Engraving ability.”