If you want to thrive in Dying Light 2, you're going to have to adventure at night. However, the undead isn't the only threat that shows up come sundown. Players are infected with the virus that has claimed much of the world, turning them into zombies, and the only way to fight it is with UV rays, either from UV lamps or the sun. Once the sun is down, players will have to rely on bases with UV lamps or UV Shroomz to survive. Here's how and where you can find UV Shroomz in Dying Light 2.
Along with UV Shroomz, these rooftops have a buffet of free materials. Honey, camomile, resin, and other crafting materials can be found across these areas, along with some basic weapons. If you're ever in a pinch and need some essential materials, be sure to look out for one of these roofs.
Using a UV Shroom restores your resistance to the infection, although not by much. After crumbling one up and inhaling it, your character will have about 30 extra seconds before they turn. It's not a lot of time, but with enough on hand, you can explore the city after sunset freely and without worrying about joining the undead.