http://www.newsweek.com/fortnite-skull-trooper-event-challenges-ghost-portal-easy-1167407

Fortnite fans are freaking out over the return of the Skull Trooper, and with it came the Ghost Portal Back Bling. The Ghost Portal could initially be unlocked by completing a specific set of challenges, but Epic has decided to make the process easier for the weekend via a special Skull Trooper Event.

The Skull Trooper Challenges will be fixed in 'Fortnite' update 6.10 next week. Epic Games