The Oodillid
A long, and slimey creature who is rumored to live beneath Kierketholl. It is said to be reasonably dangerous, and exceptionally hard to kill. Many people claim to have seen it, and their accounts describe it as a long, worm like being made from slime. It seems to have the ability to regenerate its own body at an alarming rate.
Many Mistbreathers of Kierketholl claim to know someone who was attacked by it.