Source: Tyranny of Dragons

Weapon, rare

A dagger fashioned from the tooth of a dragon. While the blade is obviously a fang or predator's tooth, the handle is leather wrapped around the root of the tooth, and there is no cross-guard.

You gain a +1 bonus to attack rolls and damage rolls you make with this weapon. On a hit with this weapon, the target takes an extra 1d6 acid damage.

Draconic Potency. Against enemies of the Cult of the Dragon, the dagger's bonus to attack rolls and damage rolls increases to +2, and the extra acid damage increases to 2d6.