@ultimaodin: Ah yes, to continue in the fortress you need to solve something in the main room. Take a look around the ground in the upper part of the map. Do you notice anything? If you're still confused, I'll give you a better hint.
By the way, I've mentioned this before, having the secret char as the leader is just a slight glitch I overlooked, but it doesn't affect gameplay so I'm leaving her there. But about the comment about dead people, when did they appear? This might be something else I guess I overlooked.
@Mesh90: That's understandable, but unfortunately I can't access my project file right now due to technical problems. Could you provide a screenshot of the puzzle, or have someone else help you? I won't be able to provide an exact solution until I can see the map.