Availability: After Completing “A Pact With Rais (Second Half)”
Location: Osman is underground, far north of the Tower
Rewards: 5,000 Survivor XP and $1,000
Difficulty: Medium
Look in the tunnels at the north end of the map after completing Rais’ tasks. A man who you saw earlier is living in there, inside a cell. Talk to him and see what you can do to help. He sends you to find his brother.
Leave the area and head south to the market. Go inside the marked building when you hear cries of distress. Pick the lock on the door to your left and look for an entrance to the ventilation duct over your head. Climb into the duct to head deeper into the building.
Go all the way to the end of the ducts and drop into a warehouse room. Avoid a Bomber (if it hasn’t triggered already while you were in the ducts) and then fight off a large wave of Virals that breaks into the room.
Open the door into a small room in the corner to meet the guy you were supposed to find. Then, return to Osman using the door behind him to get outside. Many Infected gather because of the market’s alarm system, so Vault over them and flee.
Get back to Osman’s tunnels and bring explosives if you can. There are quite a few of Rais’ men in the area, and they don’t have much room to dodge. Guns are a good idea too. Kill Rais’ people and then search for Osman. Talk to him to finish the quest. He gives you Keys to three different stashes around town.