https://www.polygon.com/fortnite/2018/9/18/17873386/fortnite-patch-5-41-changes-port-a-fortress-spiky-stadium

Today’s Fortnite patch is pretty interesting, bringing the additions of the Port-a-Fortress item and a new item for the Playground that allows you to spawn your own Spiky Stadium that’s enclosed by damage traps and bouncers. You can see an image of what it will look like at the top of this post, and there’s a video of the Port-a-Fortress in action below.

The Port-a-Fortress is basically a Port-a-Fort that spawns a much more imposing structure when thrown. It’s the ideal item if you need the high ground very, very quickly.