This guide will let you know where to get Thestral Hair in Hogwarts Legacy.
Thestral is the dark horse-like beast in Hogwarts Legacy. You must make your way to Thestral den near the East North Ford Bog.
Switching to the story difficulty is recommended to capture the beast quickly. So head to the location and use your nap sack to capture Thestral.
You can capture more than one if you want. Afterwards, head back to Hogwarts and go to the room of requirement. Heading inside the vivarium and put your Beastdown through the Manage Beast menu. Then you have to use the Beast Petting Brush and Beast Feed spells. Each animal has a food icon and care icon next to their name; now, you feed them, and the food icon will turn green. And if you brush them, the care icon will turn green. You need to turn both of them green.