Ocean's Roar Cave is the fourth dungeon in Dark Cloud 2 and takes place during Chapter 4: Goodbye Shingala. It is located in the Veniccio coast, and contains floors set in underground sea caves and above-ground coastlines. The intermediate floors contain only underground portions, and so spheda may be played here. The gate key used is the Luna Stone, and getting through blocked paths requires the Luna Piece. The Ocean's Roar Cave introduces the Aquarium and the Finny Frenzy to the player.