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Frost Oil vs Rune of Forbidden Knowledge

Frost Oil
Requires Level 30
Use: When applied to a melee weapon it gives a 10% chance of casting Frostbolt at the opponent when it hits. Lasts 30 minutes.
Sells for 1 Silver 50 Copper to vendors
Item Level 40

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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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Side by side:

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

Stat Frost Oil Rune of Forbidden Knowledge Δ
Item Level 40 40 0
Required Level 30 −29
Sell Price 1s 50c −1s 50c
Binding Binds when picked up

Δ is Rune of Forbidden Knowledge minus Frost Oil: green where Rune of Forbidden Knowledge 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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