In the game we do have ghosts. A ghost is merely as we know it. One is who dead. The nic for a new character must be made. (example: soandso has been killed, committed suicide, ect. He is now known as ghost-of-soandso, or the_ghost_of soandso...) NO OTHER EXCEPTIONS WILL BE ACCEPTED, you must make yourself to be that character...and the name must also show it.
A ghost is not someone who can fight, or cause physical harm. He/she can however, haunt and make life miserable as the presense of that person is felt. You cannot die twice therefore you cannot be killed. But even a ghost has to follow the rules set up in the Land of Cain.
A ghost can move through walls. Vanish, rattle chains and moan. He can however be placed in a orb, or some form of container that is created by one of magic, therefore it is there he will remain unless released. He can be sent into a (void, or rift a locket or some other object that can contain him) and thus being gone once again. He can be sent to the very pits of hell.. But all must be done with rules to make is happen. I would think only one of magic or of great powers can make these things happen.
A ghost appears merely as a mist for a period of up to 10 minutes, or he can take of the physical appearance of the person who is dead.. but only for a short amount of time (5 minutes maximum) at which point he can speak throught the mind of the one he wishes to send a message to.