Apple Core is an item that replenishes Energy. When used, it restores 10 Energy and expires in 2 days. Apple Core was available only during the Halloween Event and was found by using the Pirate Ghostship to go on Voyages. The player needed to reach a new Mastery Level and then was awarded a set of Apple Cores and Halloween Treats for the Halloween Pumpkin. It could also be sent and received as a Gift from Neighbors.