This article or section includes speculation, observations or opinions possibly supported by lore or by Blizzard officials. It should not be taken as representing official lore.
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.