The Ocean Crystal or Blue Crystal is the fourth Crystal that can be added to the Dark Crystal. You will receive the Ocean Crystal after defeating the Ocean Boss, the Piranhas. You will also receive the Spyglass Mould to make a Spyglass, allowing the Pirate to find Green Treasure Maps.
|Monsters||Sky Chicken • Faradox Minion 1 • Faradox Minion 2|
|Crystals|| Dark Crystal • Sky Crystal • Forest Crystal • Fire Crystal |
Ocean Crystal • Dungeon Crystal