If you've never heard of it, go
here
Its one of the best MMOs, because it actually requires skill! Whereas with runescape, you just click a lot, with this, you fight other bots in real-time, and ir requires tactics, and fast reactions to dodge enemy attacks. The attack system is like real life rather than based on a random dice throw. Also, there's going to be in total 100 levels, and many types of battle (eg. Sector, team, individual, base modes) which are already implemented.
It's only downside is that it's a rather large d/l. I assure you, it's worth it though!
My name is Diggsey on it