Moria

Moria: the fallen realm of Durin's folk. In the great kingdom of Khazad-Dum, the dwarves delved too greedily and too deep and awoke ancient monsters. Now the kingdom that once was theirs is the domain of orcs, trolls and balrogs.

Moria has both internal conflict between tribes in its dark caverns, and external RP in the eternal war against light and good. There are attacks against Moria to the south, and ambushes on travelers through the High Pass to the north. Orc RP is crude and vigorous, and includes lots of fighting and lots of dying. There are shamans, warriors, slaves and warg-riders.

There are many places on the internet where more information about Moria can be found; one is here.