Dark Matter is a Legendary Fortnite Back Bling from the Space Explorers set. Dark Matter was available via the Battle Pass during Season 3 and could be unlocked at Tier 71.
How-to Get the Dark Matter Back Bling
Dark Matter is part of Season 3. If that season is still currently in the game, you can obtain this item by purchasing and/or leveling up your Battle Pass.
Space Explorers Set
Dark Matter is part of the Space Explorers set! You can find all of the items that belong to it below.