Hexahedron Mud, once you get to know the people here you won't ever leave, hehe. The people are generous and helpful. The immortals are as well, and all are generally happy to give newbies a hand. If you have any questions, asking it on OOC will usually result in an answer.

The areas are unique and original, and there are quite a few of them. I even built one or two myself. They are always looking for builders, especially if you are already experienced, but they are willing to train as well. The Head Builder, Epoic, is very open and accepting of new ideas. Basically you will have free reign in your area, subject to review of course. There are several custom skills, classes, and a nice remort system. This mud keeps you busy! :)