Confirmed Starmourn has been recently moonlighted to a "legacy" game. It's still playable and you can still make new characters and interact with everything in the game but it's no longer under active development.

Which is a shame, really, because Starmourn was cool as hell. It just apparently wasn't all that popular compared to some of the others, so it's being put on a back burner to preserve resources at Iron Realms, which is understandable.

I am a fan of Iron Realms MUDs personally though if only because of their Nexus user interface. I find it a lot more approachable and well put together than others I've tried (namely, Aardwolf, in fact). Very clear and concise and nearly infinitely customizable with user scripts. I haven't been invested enough into MUDs long enough to speak for end game though, so someone else will have to speak on that. But introductions and it would seem up through at least mid game on most iron realms games (which could consist of hundreds of hours, frankly, to even reach midgame sometimes) are totally fine and fun.