https://www.polygon.com/2018/4/10/17219472/fortnite-battle-royale-port-a-fort-item-update

Fortnite Battle Royale’s building game is about to change, thanks to a new item: the Port-a-Fort.

Epic Games revealed the new item, which is “coming soon” to Fortnite, that will let players build defensive structures in the blink of an eye. It’s essentially a grenade that gives players the high ground and tactical advantage, according to its official description: “New portable fort sprouts a quick defensive position upon impact.”