You need some ideas? Well, let me think...
- Living labyrinth: The labyrinth can change, when you pull a switch or whatever the walls start to move and paths are closed/opend. I don't know how you can do this without using buildings as movable walls, but that's your problem
, it whould be AWESOME when you manage to do this AND it looks good (so not an supley depot as wall or something)
- Random events like creatures which suddenly stand right next to you, scary sounds, suddenly get locked (by moving walls) and creatures spawn around you until the walls move back again (wich they do in 10 sec or something)
- Eating and drinking: Your hero('s) need to eat and drink enough to survive, you can take some food and water with you but you need to refill quite often, water can be found at wells, food can be get from fruit trees or something. When you haven't eaten for a while (when you do have food it will be eaten automaticly) you will die, of course
.
Ideas enough ?