Arc Raiders Guide by U4GM: Humidifier Routes U4GM keeps Arc Raiders simple: grab Humidifiers fast from Buried City's Red Tower, then finish your Caravan Expedition without the fuss. If Red Tower's already picked clean, our item hub at https://www.u4gm.com/arc-raiders/items has straight-talking tips, current loot info, and a few smarter ways to keep your run moving.