Destiny 2 Cloud Accretions are the new local resource for Neptune, and you'll want to haul in as much as you can if you want to get your hands on some high-level gear – something that's invaluable early on in the campaign, especially if you're tackling the story on legendary difficulty.
Thankfully, Destiny 2 Cloud Accretions aren't a crafting resource, they only serve to increase your rank with Nimbus in the FPS game.
How to get Destiny 2 Cloud Accretions
Cloud Accretions can be found dotted around Neomuna. They look like metal tree roots, and to pick them up simply press the 'use' button when in close proximity. Each time you pick up a Cloud Accretion, you're awarded 20 Neomuna reputation to increase your rank with Nimbus, plus a small amount of Glimmer. Whenever you increase your rank with Nimbus, you gain access to another rank reward and a legendary engram.
How to find Cloud Accretions on Neomuna
Neomuna is a large area, and Cloud Accretions respawn fairly quickly, so if you're taking a break from the soft cap, it's worth taking a few laps around the futuristic city. Try using a resource-finding mod on your Ghost to mark any Cloud Accretions in your immediate area. The Wombo Detector mod will cost six energy, but will allow you to detect resources and caches within a 50-meter range, making it painless to find Cloud Accretions around Neomuna.
Now that you know where to find Destiny 2 Cloud Accretions, it's time to become best friends with Nimbus and get that rank to the maximum. When you have the full set of Nimbus armour, add it to a The Witness can throw at you.