Go to the Dancing Peacock and speak to Kirtida to accept this quest. "This request is from a researcher working for the Grand Court. Have you ever been to the Underground Lake? It is a frigid place, covered in ice. Some say within that ice is preserved the corpse of an ancient creature. The researcher would like you to bring its remainst here to Tharsis. But the ice is very thick... it will not be easy to remove. I suppose that is why they called upon you. Take care, and I shall await your swift return."