Demonsteel Bar

Demonsteel is a metal introduced in Legion and is made by combining Felslate with Leystone Ore.

Source
This item is created with Blacksmithing (1); taught by Recipe: Demonsteel Bar.

Blacksmithing

 * "The Felic"
 * Demonsteel Armguards
 * Demonsteel Boots
 * Demonsteel Breastplate
 * Demonsteel Gauntlets
 * Demonsteel Greaves
 * Demonsteel Helm
 * Demonsteel Pauldrons
 * Demonsteel Waistguard
 * Consecrated Spike
 * Flamespike
 * Gleaming Iron Spike
 * Terrorspike
 * Steelbound Harness
 * Demonsteel Stirrups

Engineering

 * Ironsight Cranial Cannon
 * Shockinator

Speculation
Due to Demonsteel being created by combining Felslate and Leystone, it is possible the outcome is medium-weight but extremely resilient armor or weaponry. Felslate is naturally a very heavy metal, while Leystone is the opposite, thus balancing the weight. Yet both are sturdy materials, possibly combining their strength.

It is unclear if demonsteel retains the corrupting effects and limb-replacement capabilities of felslate. See felslate for more information.