by Scapes.

If you wound up on a different TERA server than your friends, En Masse Entertainment has got you covered. Our account management system will offer server transfers starting April 30—a day before TERA officially launches. True action combat is better with friends, after all.
Server transfers will be free and immediate (no waiting period) throughout the initial rush of new players to TERA. Once the server populations stabilize, we'll place limits on the number of transfers, the level of your character, and how much gold you can take with you to your new server. We'll charge for server transfers you make for convenience reasons, but transfers made to balance server populations will always be free.
The following limitations apply to server transfers:
A bustling but not overcrowded server is key to the TERA experience, so we won't allow transfers to servers that are already oversaturated; we can monitor populations in real time and adjust server eligibility on the fly. Learn more about how to transfer servers.