Beast Manes in Tales of Arise are a special material players need to collect if they're looking to craft the Gale Wing Sword for Alphen. The material can generally be harvested from one specific and rare type of enemy called Alpha Withered Wolves. Luckily, there's an encounter in the game guaranteed to supply the player with the Beast Manes they need to craft the Gale Wing Sword.
Beast Mane in Tales of Arise: Where to Get it
To craft the Gale Wing Sword, players need to collect a Razor-Tipped Feather, eight Hard Bones and — trickiest of the three — two Beast Manes. To get your Beast Manes, the easiest way is to head to the snow-covered Rudhir Forest. As you move through the forest you'll be ambushed by wolves that will drop the coveted manes.
You should run into the ambush when you reach a circular area at the north end of the forest. You'll know it's coming as you'll be given the chance to replenish your party's health and cure points, and you'll see a merchant in the area just before the encounter.
Entering the encounter, you'll come face to fae with three Ice Wolves and an Ice Wolf Leader. Killing these enemies will drop Beast Manes, a Hard Bone and a Sharp Fang. The manes can then be used at a forge to craft the Gale Wing Sword.