|Marcus Vending Machine - The Droughts||Cash, Head Skin, Red Chest (Optional Objective)||2|
Once you've completed the first mission and entered The Droughts, you'll be able to start your first Side Mission within Borderlands 3. To locate the mission open up your map and head on over to the exclamation mark, where you'll be able to interact with the vending machine.
Once you've accepted the Side Mission, follow the yellow wire that leads you towards a Catch-a-Ride station with a broken power box. Once you've interacted with it, you'll need to find a skag spine.
Note: Side Missions within Borderlands 3 have a chance to give you an Optional Objective, it's always a good idea to do them as they give you bonus rewards at the end.
Locate human spine (Optional Objective)
To complete this Optional Objective you'll need to find a Fanatic that will drop a human spine. Make your way up a container and follow the path around until you stumble across a Fanatic roaming outside his camp, take him out to receive your human spine.
Now you have your human spine, take it back to the broken power box and insert it to complete your Optional Objective.
Locate skag spine
Unfortunately the human spine didn't work out, so you'll need to head back out to find a skag spine. Follow the waypoint down to a cave where there will be lurking Skags, take them out to spawn in the Badass Shock Skag. After you've dealt with the Shock Skag he will drop you the skag spine. Insert it into the broken power box back at the Catch-a-Ride Station.
Now that you've repaired Marcus' power box you'll now have access to his vending machine which will allow you to purchase better weapons.
Go to secret stash
For completing the Optional Objective Marcus will reward you with some bonus loot, head over to his vending machine that you interacted with at the beginning of the mission to find his secret room. Inside you'll find your first Red Chest waiting for you, one of your targets for Zone Completion in The Droughts.