This page of the Ratchet & Clank Rift Apart guide has the first part of the walkthrough for Scarstu Debris Field. You will learn how to get to the Gastropub, what attractions await Rivet in the Gastropub, and how to unlock fights in the arena.
Scarstu Debris Field is an asteroid field. You will see the Gastropub in the distance after landing on a metal platform. You need to get to that building.
However, we do not recommend rushing to complete the main objective of the mission. Look around near the starting area for a magnetic path - use it to get below the main platforms. Find the place from the picture and jump to the next path (a hexagon must appear on it - press Circle) and get the secret - Gold Bolt.
Return to the main platforms and explore the eastern area - you will discover the Pocket Dimension shown in the image. It leads to a location with an obstacle course - your task is to run or jump between platforms that are horizontal at the moment. Always take time to observe how the platforms move to reduce the risk of falling.
Finally, you will reach a piece of armor (Q-Force Helmet).
Head towards the Gastropub. Along the way, you will come across Mrs. Zurkon's store. The trader now sells a great weapon - Lightning Rod. It costs 8,000 bolts - you should definitely purchase it if you have enough bolts. Otherwise, go back for the weapon after you collect enough bolts by fighting in the arena.
Lightning Rod is able to electrocute enemies and not only depletes their health points but also renders them temporarily defenseless. An additional advantage of this weapon is that after electrocuting an enemy, the discharge can also transfer to other opponents standing nearby. Thus, it is an excellent weapon for weakening groups of opponents.
Choose the portal leading to the Gastropub. Rivet can't use weapons in this location, but that's not a problem because you won't encounter any enemies here.
In Gastropub's main room, you can find a Craiggerbear, dance, and change the song in the juke machine (doing this 3 times unlocks a trophy). Approaching the bar will a cut-scene during which you will meet Zurkie and Pierre. The arena battles are now available - we described the first set of them on the next page of the walkthrough.