Burning Post II is a medieval Mud set on the parallel world of Urth. (Don't let the Mud codebase scare you as roleplay is the primary focus, though it has much of the automation of a Mud, primarily combat and some skill based crafts). Burning Post II (BurPs) is as close to a Mud/Mush hybrid as I have seen, worth checking out.
The story so far: The world of Urth is similar to medieval Earth, however magic and demons are real. The primary religion is the Davite religion, which is similar to Catholic Christianity and is diametrically opposed to the use of magic. Those who are suspected of using magic are burned at the stake, hence the name Burning Post.
After a series of wars and inquisitions, a mysterious magical shroud has fallen around the island of New Yarsith and the nearby county of Linden. Demons have been appearing through strange portals, causing much destruction. New Yarsith and Linden county are highly religious while far to the south lies the free city of Oceanwall. Oceanwall is more of a free-city where magic is allowed and thrives, much more chaotic with looser laws.
There are open roles in both the New Yarsith and Oceanwall areas. Want to play a zealous knight with a dirty secret? New Yarsith might be where you want to start. Want to play a herbalist that dabbles in magic? Oceanwall is a good starting point.
Concepts the game needs:
Troubadours- Storytellers, musicians, poets
Reeves- Local law enforcement for both cities
Orderites- Davite clergy in both cities: Missionaries, Priests, Knights, nuns, etc
Merchant/Crafters- Woodworkers, Smiths, Jewelers, etc
Mercenaries- Down and dirty gritty sword for hire types
Those aren't the only concepts, there also other factions that have an active player base such as, tavern owners, Doctors, Chimerists (alchemists), etc. The game is levelless and there is nothing stopping you from delving into another field. Skills are gained through XP and XP is gained through RP, so the incentive to go out and RP is there. Combat is handled through emotes called Cemotes, in which you pose backflipping in the air and slashing (Ok, I'm exaggerating) at your opponent and your skill and code handle whether you hit or not.
The game has a small, mature playerbase and is looking to grow. Come on down and roll up a character, poke around a bit. BurPs is currently gearing up for a new story arc, the staff are open to many concepts and the players are extremely helpful in answering questions.
BurPs wiki: http://www.burningpost2.co.uk/wiki/Burning_Post_II_MUD
Telnet: www.burningpost2.co.uk:4321
See you there!