As far as I know, once you choose a server you live there forever... As for the types, there is little difference 'cept in PvP you can be attacked by any character from the opposing faction, anywhere, anytime; in a PvE server, the only way to be attacked by the other faction is to travel in lands controled by the other faction, walk in a no-mans-land type area, complete FFA, or choose to fight someone in a frendly dual. Hope this helps. ˆˆ
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Rehuhu of Kujata