Vetusia now runs its three worlds -- Valdera, Orvana and Nyxera -- as fully separate game server processes, each with its own playtime, economy, market and community, instead of all characters sharing one single world.
In practice, this is what changes for you: your account stays single -- the same account number and password log you into any of the three -- but everything that happens inside one world stays inside it. Level, items, gold and characters never cross over from one world to another, and there is no way to move a character or its belongings between worlds after it is created.
Why keep them separate at all, instead of one world with different zones? Because the whole point of offering different rates is that each world develops its own economy and its own pace of play -- mixing them would mean a Nyxera character, ten levels ahead for the same play time, competing for the same hunting grounds and market prices as a Valdera one. Keeping the worlds fully isolated is what makes the choice between them actually meaningful.
The site panel reflects this too: highscores, who's online, kill statistics and houses all let you filter by world, so you are always looking at the right one.