This quest will expire after the events at the Mechonis Core.
Preparing for Adventure 2 is a Timed Quest in Xenoblade Chronicles. It can be received from Kurralth at Alcamoth, just north of the Fountain of Eternity. If Dunban is in the active party, he will comment.
"You found the missing item at Eryth Sea and returned it to Zain's friend, Kurralth."