The components are pure thought.

Exploration Stage: Foggy Oasis
From: Vera
Description: Does the pearl that appeared in Lucas' hand resemble a materialized thought? Whose thoughts are they? My brother cannot think clearly while dreaming. Did someone want to send a nightmare to my brother? Could the plan have been the pearl? If you have a vessel for the mind, you can investigate. Find it!
Completed: I borrowed the vessel of the mind you found from the pawn shop. With it, you can read every aspect of your thoughts in detail, including images, sounds, and smells. You put a pearl in this vessel, but you see only a faint image... and nothing smells! This can only happen in a dream!