Demon Edge gives 46 damage to the holder and is a component of Monkey King Bar, Daedalus, and Divine Rapier. Demon Edge's cost per added damage is very efficient relative to other Basic damage items such as Claymore and Sacred Relic, but it is generally only purchased in order to make one of its upgrades.
Its hilt is made of Dire stone and its blade is made of Radiant ore. It is said that the Ancients are made from the same materials. Demon Edge should only be purchased in the process of building toward one of its higher tier items, as its damage output is simply outclassed by those items in all cases.
You can download this papercraft template here: DotA 2 - Demon Edge Sword Free Papercraft Download [DropBox]