A skeleton

Behind the doors you find a circular room, with a radius of about 2 meters. In the center of the room is a lone skeleton holding a rusty sword in one hand and a small, rusty shield in the other. He looks at you when you enter, but does not move to attack you.

As soon as you are inside the room the doors behind you slum shut. You turn to look at them... and see nothing but solid stone wall. Looks like there's no going back. So you turn your attention to the rest of the room. The floor, walls and ceiling are all made from dull grey stone. The only things not made from stone are the three wooden doors at the far end of the room. The skeleton blocks the most direct path to them, but there are no other obstacles you can see, so reaching the doors should be possible...