Holding the candle in your teeth, you find some sturdy beams, and begin to descend. Below you to your right, you see a small hole in the wall, in which something shiny has been placed.
You hold onto a beam with one arm, and grab inside the hole with the other. You pull out a penknife!
You hear some very unfriendly growls from the apparently large creature, somewhere just out of sight. Perhaps it would be best to climb back up.

You can:
jump down safely and face the creature,
or climb back up.