City of the Forgotten
Source: Yaen

1. Location

2. Island Heart acquisition

  • The Island Heart can be randomly obtained from a chest.
  • In order to open a chest you have to fish a key at any spot on the island. Rank doesn’t matter.
  • Fishing can get you keys to open chests around the island.

  • There is also a purple quest on the island. It is straightforward and not required for the Island Heart. At the end of the quest, you’re given a purple key which only opens a certain box.

3. Mococo Seeds