How to Initiate Cross-World Travel?

The process is straightforward: Locate a Main City Aetheryte: Travel to any of the three main city-states: Limsa Lominsa, Gridania, or Ul'dah. Interact with the Aetheryte: Target the main Aetheryte crystal in the city center and select "Teleport.

How to Initiate Data Center Travel?

Data Center Travel is initiated from the character selection screen: Log Out to Character Selection: From within the game, log out to the character selection screen. You cannot initiate Data Center Travel while logged into a character.

Cross-World Travel and Data Centers

Redirecting to Cross-World Travel and Data Centers — FF14 Guide