Quote Originally Posted by ChickenWing View Post
You keep everything. The first time is free, then all other realm crossings cost 150 gems. You cannot change ream while you are in a guild. If you have switched realm recently, know that there is a 3 day cooldown before you can switch realm again.
If you are in a Guild you have to first leave the Guild and that means that you loose any Guild contributions that you have accumulated. You do get to keep any Techs that you have paid for.