Peak of Oros - Wogah Mission - Unlocks Rare Feathers (Can obtain Rare Feathers randomly when plucking normal feathers from animals)
Head over to Wogah's map marker to start the Peak of Oros mission. It is close to the village, a little bit north northeast.
Upon arriving, you will see one of the awesome spots in Oros, Eagle Cry Peak. It has a small body of water, a small waterfall, and a sick diving spot at the top. Make your way up the cliff-side. The path is linear so there is no worry of getting lost.
Your first real obstacle is a grappling point that has you swinging across a chasm and landing on the Far side.
Going along the path climbing and swinging with your grappling hook, you will find your first nest with the rare feathers. However an eagle is guarding it.
You may choose to get rid of the eagle now because it may attack you randomly.
You can attempt to shoot it down with an arrow while it is flying which is harder. Or you can wait for it to attack since it beelines for you when it attacks, leaving it open to your shot.
Whether you decide to kill it or ignore it, pick up the rare feathers from the nest.
Continue up the cliff and you will find the hardest part of this mission. The part where you swing from root to root without landing. You'll get the hang of this soon. Just make your swings wider to get you more altitude and giving you more time to attach the grappling hook to the next root.
When you climb up to the peak, there will be another eagle. Turn him into BBQ if you want to by setting your arrow on fire and shooting him which will also cook him. To make it even more ridiculous, use a flaming spear.
Go and grab the last feather and you will be prompted to take a dive below.
Go and take a dive into the water below.
The mission is completed and you now have the chance to get rare feathers among other feathers you pluck.