Rune of Burning Darkness vs Riverglades Marsh Gas

Rune of Burning Darkness
Binds when picked up
Classes: Warlock
Use: Engrave your belt with the Shadow and Flame rune: Hitting an enemy with Conflagrate increases all Shadow damage you deal by 10% for 20 sec, and hitting an enemy with Shadowburn increases all Fire damage you deal by 10% for 20 sec. In addition, Conflagrate has a 100% chance not to consume Immolate, and Shadowburn has a 100% chance to instantly refund a Soul Shard.
Use: Learning
"Teaches you a new Engraving ability."
Item Level 40
CHANGED Changed in Forever: effects.

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Riverglades Marsh Gas
Binds when picked up
Use: Reduces movement speed by 50% and increases Fire damage taken by all targets in a 5 yard radius by 15 for 15 sec.
Sells for 2 Silver 4 Copper to vendors
Item Level 38
FOREVER New in World of Warcraft Forever: not in Classic Era.

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Side by side:

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Stat Rune of Burning Darkness Riverglades Marsh Gas Δ
Item Level 40 38 −2
Sell Price 2s 4c +2s 4c
Binding Binds when picked up Binds when picked up

Δ is Riverglades Marsh Gas minus Rune of Burning Darkness: green where Riverglades Marsh Gas 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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