Thas'dorah, Legacy of the Windrunners

Thas'dorah, Legacy of the Windrunners is the artifact used by marksmanship hunters in World of Warcraft: Legion.

It is the bow of Alleria Windrunner.

Background
From the official Legion site:
 * Legend has it that this elven family heirloom—once wielded by an infamous Ranger-General—can turn a mediocre archer into a master marksman… and make a master truly peerless.

From the Legion: Hunter Artifact Reveal
 * A proud heirloom of the Windrunner family, Thas'dorah was carved from a bough of the mother tree of Eversong Woods shortly after the elven kingdom of Quel'Thalas was founded. Handed down to the eldest of each generation, the bow was last wielded by the high elf Ranger Captain Alleria Windrunner. It disappeared along with its owner following the destruction of the orcs' homeworld, Draenor, and the subsequent formation of Outland.

Base
Hidden trait: Windrunning