Fortnite: How to Complete Season 5 Week 15 Challenges Here's your last set of challenges to end Season 5. This is the end. Fortnite Chapter 2 Season 5 will officially end next week, which means the Fortnite Season 5 Week 15 challenges will be the last set of objectives that you are going to complete this season. Similar to all the previous weeks in the game, Fortnite Season 5 Week 15 challenges tasks you to complete a bunch of Epic and Legendary challenges to receive the rewards that have been set for each one of them. Here’s the list of challenges: FORTNITE SKINS: Fortnite: How To Complete The Marigold Challenges