
The idea is a system of 'ruins' for multiple fighters/wizards at the same time, putting a chance to put some tactical ideas into effect, and also to give a proper reward to fighters.
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A group of people (we shall call this the party) approaches the ruins (Room A). The 'door' is really a teleporter. All of them get a chance to walk into the ruins, but once someone enters room B, the outside teleporter is disabled. This ensures that people who enter the ruins don't get reinforcments, or people who die don't revive themselves and come back in. Each ruins also has a time limit, this is to ensure that nobody stays and waits until they heal up totally, and to wait for mana stuff to go up bla bla bla. Its also a way to expell logged out characters.
Room C isn't really a room, its a set of rooms, a maze or whatever, each ruin is different. Room C contains a large amount of monsters, of increasing difficulty. Any person who dies CAN leave through the teleporter in room B (its one way), but he can't return. His items remain there, and unless a surviving party member collects them, they are lost. A character may leave the ruins in the same way, even if he is alive.
The monsters in room C do not respawn, and once they are all killed... the party gets a chance to go into room D.
Room D is the treasure chest. A 'treasure' NPC with very very good drops is killed... and the party takes the lot.
That way, interactivity and party forming are promoted, good fighters have something else to kill with good reward, and its fun.
Once the time limit is up, the teleporter starts working again, and the monsters are respawned. (Perhaps a limit should be put into place, to prevent farming).