Genshin Impact : Tail of Boreas

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To get Tail of Boreas, you need to complete the Wolf of the North Challenge, Weekly World Boss — Andrius, Dominator of Wolves. The Wolf of the North Challenge is located in Wolvendom in Mondstadt. Teleport to Windwail Highland, the Teleport Waypoint located above or below Wolvendom. If you teleport to the southern waypoint, you have to climb to get to the boss arena. At the northern waypoint, you can follow the path southwest. Check the image below for the exact location.

Andrius has many rewards depending on your World Level. To obtain Tail of Boreas, your WL needs to be on WL 5, as Andrius has to be above Level 70. To get to WL 5, you need to have completed the following.

Be on WL 4
It's an automatic increase to WL 5 upon hitting Adventure Rank 40

Upon Andrius's defeat, a Trounce Blossom will appear, and to claim the rewards, you must spend 30/60 Original Resin. You don't have to claim the rewards if you choose not to do so. Due to Andrius being a Weekly Boss, you can only get the rewards once every week. You can defeat the boss as many times as you want; however, you will not a get Trounce Blossom more than once. The Boss Reward will respawn every Monday at 4 am (Server Time.)

A handful of tail scales from the Great Wolf King of the North. Even without its physical body and beyond death, Andrius still possesses extraordinary powers. It took a form comprised of ice and wind to embrace a new challenge, but even such form could not house all of its power. The ice scales that fell during the battle still retain some of its spiritual energy.