The Art of War

Speak with Rosa in the Sterling Hotel's bar area to accept the quest. She will tell you about a gang with a stash in The Metro.

Fast Travel back to The Metro and enter the first area with two downed train cars.

Run to the back and interact with the laptop on top of some crates to start downloading a file.

Defend the laptop from three waves of zombies: first wave has runners and walkers, second wave has two Crushers with more runners and walkers, and the third wave has a Butcher with minor zombies.

After defeating the Butcher, interact with the laptop again.

Use the nearby Blueprint Table to resupply.

Go through the door to the left of the laptop and use a Curveball to deal with the Bursters inside. Proceed through the next door.

Jump inside the downed train car in the next room and trigger the traps.

At the end of the car, pick up the journal.

Head to your right and kill the Commuter Slobber. Grab the Subway Car Keys to open the door behind him.

Proceed through the door. You cannot exit this area without abandoning the quest.

Walk into the narrow tunnel and prepare to be ambushed by the zombie Darkest Before Dawn Crew, including a Firestorm Slobber (Oscar), an Inferno Crusher (Little Ed), two Burning Runners (Javier and Damboy), and a Burning Walker (Noel K).

Use guns and Curveballs to pick off the Burning Runners and Burning Walker first. Use Rage Mode to take out the Firestorm Slobber. Then, keep your distance from the Inferno Crusher and eliminate him.

Pick up the DBD Chest Key.

Head into the room with a blueprint and open the chest in the left corner to receive the Wildstyle weapon.

Grab the Superior Ranged Cremator Mod (a community-made modification that changes the game) off the Blueprint table.