Dragon Edge Weapons

Alter: This weapon is made from the harvested remains of a fallen dragon. With a properly reclaimed claw or tooth, the resource can be forged into a simple piercing or slashing weapon whose latent draconic powers can appear in battle.

The first time you hit a creature on your turn with this weapon with an attack that you have advantage on, its draconic magic comes forth to deal an extra 1d6 damage of the original dragon's elemental type. Weapons made from the claws or teeth of dragons change in rarity and power depending on the original dragon's age. Young dragons' bones aren't as powerful as older ones, and create uncommon weapons. Adult dragons can produce rare weapons, and ancient dragons can create very rare weapons.

Attunement: no
Rarity: Uncommon, Rare (+1)/ Very Rare (+2)
Type: any slashing or piercing weapon
Cost: 300gp, 1395gp, 31050gp

Griffons Saddlebag, Vol 1

Dragon parts in general are fiercely guarded, dragons viewing all parts of their kin as belonging to them. As such, anyone in possession of a Dragon Edge weapon faces immediate scrutiny from any kind of dragon. Anyone who is confronted by a dragon while in possession of weapons like these is expected to provide the name of the dragon who gifted it to them, and the dragon whose bones were in the weapon. Those who fail this test often reliquish the deed to their mortality, and their weapons decorate a dragons hoard once again.