For the present, I'd like to try describing this without resorting to diagrams.
The mouth of the cave is quite unspectacular ... it is little more than a hole about 8 feet wide, with a short drop that quickly turns to a smooth, steep slope, curving down from the top of the hole out of sight. The bottom of the curve that can be seen, the party would guess, is perhaps 30-35 feet below.
The air near the cave, or hole, is a bit cooler than the ambient atmosphere - the druid detects a definite odor of fresh water, and the sides of the drop are damp - though by no means wet.
There is a sign next to the hole that reads, simply, 'FEAR,' in black faded letters about four inches high. The sign is small, about half the size of a small shield, attached to a stake that is pounded into the clay surrounding the hole. Further out are a number of strong, gnarled pine trees, the nearest about twelve feet from the hole, with a trunk 8 inches thick. A moment's examination will show that the bark of the tree near the bottom has been worn smooth, as if with ropes regularly rubbed up and down upon it.
|Tree not to scale|