The expedition
The expedition is a large shared world. You reach it via the expedition pier in the harbor or with /dragon expedition.
You build nothing there, but you gather: wood, ore and herbs grow back. At night and away from villages enemies lurk; in the spawn village Nebelsteg you are safe.
Beacons bring you back when you fall. Your belongings stay as a bundle where you died; pick it up while you are online (20 minutes). The keeper chest at lit beacons stores things safely.
/dragon expedition last takes you back to your last spot.