As of today's server save (August 01), the game worlds Eldera, Fortera and Xylana will be actively shielded by BattlEye.
Therefore, having BattlEye activated will be mandatory if you want to play there.
If BattlEye detects a cheating program or a manipulated client, you will not be able to connect and play on these game worlds.
Please also keep in mind that you will also no longer be able to use the Flash client on any of these game worlds.
Have fun in Tibia,
Your Community Managers