Rune of Infernal Armor vs Elemental Sharpening Stone

Rune of Infernal Armor
Binds when picked up
Classes: Warlock
Use: Engrave your cloak with the Infernal Armor rune: Your spirit becomes infused with demonic energy, reducing all Magic damage you take by a percentage equal to 60% of your Physical damage reduction from armor. Lasts 10 sec.
Use: Learning
"Teaches you a new Engraving ability."
Item Level 60

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Elemental Sharpening Stone
Binds when picked up
Use: Increase critical chance on a melee weapon by 2% for 30 minutes.
Sells for 12 Silver 50 Copper to vendors
Item Level 60
FOREVER New in World of Warcraft Forever: not in Classic Era.

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Side by side:

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

Stat Rune of Infernal Armor Elemental Sharpening Stone Δ
Item Level 60 60 0
Sell Price 12s 50c +12s 50c
Binding Binds when picked up Binds when picked up

Δ is Elemental Sharpening Stone minus Rune of Infernal Armor: green where Elemental Sharpening Stone 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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