There are 6 Owls to track down and return to the Owl Forest in Cyslodia for Tales of Arise. These are completely optional but offer multiple Trophies/Achievements while granting you rewards mostly in the form of cosmetics.
Owl #10 - White Silver Plains
As you head to the northeast to reach Messia 224, you’ll pass through an archway. As soon as you do, look to the right to find this Owl perched on the wall, this will present you with the Left Eyepatch.
Owl #11 - Messia 224
Once you enter Messia 224, take the left path when you reach the intersection and you’ll reach a furnace. Head around to the side here and look in the basket to find this Owl who will hand over the Wolf Ears.
Owl #12 - Nevira Snowplains
Head to the large lake to the northwest of the Nevira Snowplains and then swim to the central island. Once there, you’ll find the Owl perched on the large rock who will hand over the Wolf Tail.
Owl #13 - Cysloden Alley
In Cysloden, make your way to the Alley and then head towards the southern exit leading to Fountain Plaza Avenue. You’ll pass a market along the way and behind the stall with the large screen, the next Owl is perched on the wall who will present you with the Sunglasses.
Owl #14 - Riville Prison Tower 2F
Make your way to the room located in the southeast of this floor and search on top of the bookshelf. The Owl perched here will hand over the Devil Horn.
Owl #15 - Frozen Valley
As you head towards the Safar Sea Cave, you’ll cross a bridge and just before it, you’ll find a tree. The Owl is perched on top and will present you with the Half Frames.