The cave

As they enter the cave through a short entrance tunnel which is just large enough to allow a full grown dragon to pass, a dim blue and green glow comes from bioluminescent cave mushrooms which line the walls. They are shaped like little bowls with a needle rising from the center about four or five inches above the rim and are filled with what appears to be water but you can't tell. In the center of the cave is a small circular depression in the stone which appears to have had something resting in it at some point. Around the depression are strange circular markings which are carved somehow into the stone itself. Along the farthest wall is a ledge with a small stream flowing under it. There is a small lower portion at the water's edge that would be ideal for climb in or out of the water from. In the stream are strange sightless fish that move calmly under the surface. Catching them would seem to be easy as there are so many of them. As it is after all a cave the temperature is always at a tolerable level. A fire could probably be made in the center for added warmth if need be.