In the first week of Fortnite Season 5, you will not only have to find a treasure in “Fortnite Battle Royale“, you will also have to find some floating lightning bolts.
Once you have found all the flashes, then finish the game (or get killed) to properly save the challenge. If you leave the game manually without dying, it may not update the challenge. You can see everything under the Battle Pass challenges in the lobby. You need a Battle Pass for 1000 V-Bucks to unlock weekly challenges!
An overview of all challenges of the first week of Season 5 can be found here.
Floating Lightning bolts locations - Week 1 Season 5 Fortnite
0:00 Risky Reels - On the hill just outside
0:22 Wailing Woods - Above the trees on the north side
0:57 Junk Junction - In the middle of the area
1:18 Rocket Base - On the hill where the rocket base was
1:39 Loot Lake - Near the warehouses
2:02 Greasy Grove - In the middle of the area.
2:26 South Bridge - On the southern bridge, just below shifty shafts