This page contains information about the Payback side mission in Outriders. Here you will find a detailed walkthrough of the mission. Payback is the second side mission in Outriders. You will have to launch an attack on a bunker.
Break through the bunker and defeat Reiner
The location is quite small, so you won't have to walk ahead for long, although there are quite a few enemies along the way. You will find regular enemies, snipers, armored enemies and melee enemies. Use covers.
When you're done, take the key and go to the bunker - you'll find some equipment crates as well along the way. In the middle of the room, you will have to fight an elite enemy and his helpers. The enemy can heal, but can also send swirling flames that follow you. Try to get rid of the weaker enemies first, then focus on Reiner. After the fight, search the room - there is a chest by one of the walls.