http://www.newsweek.com/fortnite-hunting-party-challenge-week-3-guide-hidden-tier-star-wailing-woods-1163578

It’s week three of Fortnite Season 6, which means players are finally starting to fill out their Battle Passes. If you are working towards earning that sweet tier 100 werewolf skin, you are going to need to complete all of the Hunting Party Challenges. Players who complete all seven week 3 challenges will get a special loading screen that shows the location of a secret battle star. You can’t complete the challenge in Playground mode, it has to be a real game.

Fortnite Week 3 Loading Screen for the Hidden Star Epic Games