Notice that I said *subtle*. Which means, not a bloody unkillable dragon at recall like you apparently interpreted it.

Players want to be satisfied, but on a deeper level they want to be unsatisfied. This is the whole point of 'conflict'. Ever read a novel without it? Many MUD admins try to satisfy all players 100%. Their muds are failures. If you are going to go down this path, I suggest you incorporate a lot of mudsex into your mud, because otherwise there'll be no reason to play it.