This is a mysterious item that was data mined during the night following the arrival of the v9.30 patch notes. A grenade with a missile drawn on it called "Air Strike".
We can assume that once launched it will create smoke that will tell the game's airships where to drop their bombs. A real bombing attack will then fall on the unfortunate team that did not clear the area quickly enough.
It could also be launched to cover a retreat: Fortnite players tend to risk a lot for a kill, but few are willing to walk in the middle of a bombing attack to pursue an opponent.
Will it be possible to survive by building, or will the missiles destroy everything in their path?
Written by Augustin "TheGreatReview" Héliot. Translated from French by Millenium.us.org