There are multiple parts to the questline called the Pigeon Provides in Destiny 2. One of the parts included in the quest tells you to collect Pure Ether Extract. This guide will show you how you can collect 3 Pure Ether Extract from the Lost Sectors in Europa.
Collect Pure Ether Extract – Destiny 2
In the 4th part of the Pigeon Provides questline, you need to collect 3 Pure Ether Extracts. You also need to collect 10 Harpy Eggs and 5 Glacial Starwort.
To begin, go to Rathmore Chaos, Europa, and head to Perdition near Cadmus Ridge.
Go to the glaciers on your left and you will see a yellow mark. This mark leads to a small entrance to a cavern. Go inside the cavern and keep heading north.
Jump over the gap and enter the open door. Keep following the pathway until you reach an area with a staircase going up. Jump down from the ledge and defeat the incoming enemies.
You will then see red boxes on the ground and looting them can give you Pure Ether Extracts.
And there you have it, that is how you can get the Pure Ether Extract for the Pigeon Provides quest!