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 used to belong to Alleria Windrunner.

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.

Hidden trait: Windrunning

• Approaching Sylvanas or Alleria Windrunner with the bow prompts a special conversation with them.
• When Thas'dorah is equipped, the graphic includes a matching quiver with fletched arrows on the player's back.
• Artwork of Alleria in Chronicle Volume 2 does not show her wielding Thas'dorah, even though the book came out after Legion and used the in-game appearance for another artifact, the Jeweled Scepter of Sargeras, in art of Ner'zhul.
• In patch 7.3 and on the patch 7.3 key art, Alleria wields a bow that resembles Thas'dorah but differs slightly.

Thas'dorah, Legado de los Brisaveloz Thas'dorah, héritage des Coursevent