For this Fortnite challenge, Slone will ask you to visit the Slurp Factory inside the alien Mothership.
This is normal, since Slurpy Swamp was sucked up by the Mothership's giant tractor beam. You won't find this location on the map any longer, but can still visit via the ship.
How to get to the Mothership
Other weekly challenges have already asked you to interact with the Mothership. To do this, you first need to land near an Abductor saucer -- the locations of which are indicated on your mini-map at the start of the game.
Then, you must wait, you will have to wait, since the ship must take on a fluorescent green hue and launch rays downwards.
This is where you dive into it and get sucked into the ship.
This should trigger a sort of mini-game, in which you then find yourself in the Slurp Factory with only a Kymera pistolaser as your equipment.
In itself, the challenge will already be validated at this point, but be aware that by participating in the minigame you will be able to unlock extra rewards.
Avoid enemy fire and collect the golden orbs scattered all over the playing field to increase your Stars. Be careful, since you only have a limited time to get as many as possible and unlock better equipment.
There's nothing complicated about this task, but it will take some time to complete. It is therefore advisable to complete this challenge at the very beginning of the match, where there's a better chance to get legendary equipment and a shot at the Victory Royale.