Trial in the Clouds
Ghost receives coordinates to a literal floating island somewhere off the coast of the Winding Cove in the European Dead Zone. It's been cheekily dubbed "The European Aerial Zone," and apparently it's an excellent place to perform combat drills and meditate.
Investigate the European Aerial Zone.
"There's got to be a joke here. How many Warlocks does it take to make an island float?" —Ghost
Legendary Quest Step