Rune of Forbidden Knowledge vs Mysterious Troll Scroll

Rune of Forbidden Knowledge
Binds when picked up
Classes: Warlock
Use: 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.
Use: Learning
"Teaches you a new Engraving ability."
Item Level 40
CHANGED Changed in Forever: effects.

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Mysterious Troll Scroll
Classes: Mage
Use: Decipher the scroll with a Comprehension Charm. Who knows what magic it contains?
Sells for 15 Copper to vendors
Item Level 40

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Side by side:

Set your class weights in Preferences to see which is better for you.

Stat Rune of Forbidden Knowledge Mysterious Troll Scroll Δ
Item Level 40 40 0
Sell Price 15c +15c
Binding Binds when picked up

Δ is Mysterious Troll Scroll minus Rune of Forbidden Knowledge: green where Mysterious Troll Scroll is better, red where it is worse (a lower required level is better; speed and sell price have no better side). Total Stats adds up Str, Agi, Sta, Int and Spi.

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