Repulsor Blast is a Marvel Fortnite Spray. Repulsor Blast was available via the Battle Pass during Season 14 and could be unlocked at Tier 95.
How-to Get the Repulsor Blast Spray
Repulsor Blast is part of Season 14. If that season is still currently in the game, you can obtain this item by purchasing and/or leveling up your Battle Pass.