Fortnite Season 7 would be incomplete if we didn't get a taste of being a pyromaniac just for the sake of a challenge. That being said, it's good that we're setting things on fire in the game because we don't want the alien infestation to continue.
For this Fortnite week 14 challenge, we need to ignite structures at Holly Hatchery and Corny Complex. The former is an alien hotspot right now. While the latter is being abducted by the Mothership.
How to ignite structures in Holly Hatchery and Corny Complex?
Since the flame bows are missing, there's not much you can do when it comes to setting things on fire. However, there are two items with which you can actually achieve this goal.
The first one is a jar of fireflies and the second one is a can of gasoline. But where do you find these two?
It's difficult to say where you could find a jar of fireflies in Fortnite Season 7. These jars drop from chests. Their drop rates however, is very low.
Instead, you could roam about a bit in Weeping Woods and I'm sure you'll see some clusters of fireflies. Interact with them and you get your hands on a jar full of freshly brewed fireflies.
When it comes to the gas cans, you can find them at any garage or fuel station. You might find them at bus stops as well at times.
Here is a map marking the location of all the firefly clusters/firefly jars and gas cans in Fortnite Season 7.
Once you've gotten your hands on them, all you need to do is toss them at structures at Corny Complex and Holly Hatchery.
When it comes to the gas can, you will have to shoot at it though for it to explode. And once you've set about 25 structures on fire, you will have completed the challenge!