The Owl Feather is a Grimoire material and starts to drop upon starting The Ancient Art. They drop (1/9) from Owls.
¶ Summons
Owl: 2 Owl Feathers, 1 Pair of Bat Wings
Bat: 1 Owl Feather, 2 Pairs of Bat Wings
Poacher: 1 Owl Feather, 1 Pair of Bat Wings, 2 Scorpion Tails
¶ Patch History
0.1.7 - Increased drop chances from 1/18 to 1/9