You walk toward the largest grave: a towering tomb of sorts. As you approach, you spy a small figure you can't make out clearly, peeking out from behind one of the columns. You walk toward it, and it runs away, vanishing.

You notice the centre of the tomb contains a well. You pull on its rope, dredging up a bucket of dark gloopy water. You can:
drink from it,
splash it about everywhere, or
drop it back down into the well and look inspect the other graves.

You wish dearly to take the bucket with you, since you're lacking a companion on this journey, but you don't have anything to cut the rope with, and it's too slimy to tear apart or fray on any of the graves.