The Arks found in Rage 2 are vaults where you can find equipment, weapons and get new skills. Also, each completed Ark rewards you with money and experience points for one of your allies. This section of the guide describes the Ark you can find at the Dune Sea.
Shrouded Vault Ark
The ark is located in the eastern part of the location, near the two Electro Forges. They must first be completed to open the entrance to the ark.
The door to the Ark will be closed until you complete both tasks in Electro Forges.
There, you have to destroy the reactor (example in the screenshot above). Opponents will try to stop you. Eliminate them asap in order not to get overwhelmed at the end.
After the reactors are destroyed, you can return to the ark. The door will stand open in front of you.
The entrance to the Ark is at the end of the location. It will open only when there are no enemies around.
Upon completing this Ark, you will receive a weapon - Charged Pulse cannon.