Open World Sessions
Unlike standard missions, Open World mode never expires and allows persistent building.
Configuring Open World
When starting a new session on your dedicated server, you must specify the map and mode in the startup parameters:
-MapName=Olympus -IsOpenWorld=True
Styx and Prometheus
DLC maps like Styx and Prometheus also support Open World. Make sure your server has the necessary DLC access if required by the hosting provider.