The Midnight Walkers features a unique floor structure, and part of The Things Left Behind involves making your way up the many floors of the Liberty Grand Center. This towering mega-complex serves as the game’s single, unforgiving map
One of the early quests in the game is called The Things Left Behind and with this quest your job is to reach the 14th floor of the skyscrapper. It’s straightforward in objective but teaches multiple mechanics like floor cycling, careful movement, and risk assessment in high-traffic areas.
How to Complete Complete The Things Left Behind

The Things Left Behind entails finding the room the Armorer stayed in on the 14th floor. Once you’re here, the quest will require no further actions for completion, but reaching the room itself can be tricky.
Keep in mind that because of how The Midnight Walkers works, you need to wait for the 8F-15F floor selection before joining a raid.
Once this option is available, join a match, whether solo or with a group of players, and make your way to the 14th floor. There’s a chance you’ll spawn on this floor to begin with, in which case, you can skip the process of heading to the floor entirely.

On the 14th floor, you need to specifically look for Room 21, as this is where the Armorer stayed. The room numbers are marked quite clearly at the top of each door, and you can use your map to navigate to Room 21. As mentioned earlier, entering this room should complete the quest.

Focus on the southern section, where rooms are numbered in the 20-25 range. Room 21 sits right in the middle of the southern cluster of rooms. When you enter room 21 the quest completes immediately.