On the Wings of Eagles is a side quest you’ll get from the tavern in NieR Replicant version 1.22.
Your objective is to find an eagle egg from a place known as The Aerie.
Here’s how you can find the eagle egg in NieR Replicant.
Where is the eagle egg (location)
If you’re coming from the entrance of The Aerie, you should see the gold house (chief’s house) on your right hand side. The eagle egg is on the platform below the gold house.
To get to the gold house, just walk all the way straight from the entrance. Once you’ve crossed both bridges (with a platform in between), you’ll reach the other side of the mountain.
On your right, you should see a tall ladder. Climb the ladder to the top and you’ll see this image below.
Just follow the bridge to the other side and you’ll reach the gold house.
Jump down to the lower platform and you should see the eagle egg as it’s glowing.
Return the eagle egg to the tavern and get the Old Lady’s Elixir.
Bring the elixir to the old lady near the fountain in the middle of the village.
You’ll get 2,000 gold.