Castle on the Sea is an island located at the center of the Third Sea. It serves as a major hub area, bringing together many important NPCs with different functions, and unlike most islands, it has no local enemies.

Because of its central location and utility-focused design, the island is one of the main gathering points for players in the Third Sea, especially for progression, trading, and event-related activities.

Special Contents:

Pirate Raid

• Pirate Raid is a Third Sea-only event that occurs every 75 minutes (1 hour 15 minutes).

• During the event, waves of non-boss enemies from the First and Second Sea spawn.

• A tankier enemy appears as the final wave.

• The player who lands the final hit on the last enemy receives a random Blox Fruit.

• Any player who defeats at least one pirate earns 100 Fragments after the raid ends.

Raids

• Players can do Raids in the Third Sea at Castle on the Sea.

• The Mysterious Scientist is also located here for buying/trading microchips.

rip_indra True Form

• rip_indra True Form is a Level 5000 Raid Boss.

• It is spawned by pressing the Aura Color buttons with their matching Legendary Aura colors.

• After all buttons are activated, place God's Chalice on the pedestal near the entrance to summon the boss.

Portals

• Portals in Castle on the Sea connect to 3 locations.

• The left orange portal leads to Tiki Outpost.

• The middle portal leads to the Mansion on Floating Turtle.

• The right portal leads to Hydra Island.

• To access the Mansion and Hydra Island portals, the player must defeat rip_indra True Form at least once.

• To access the Tiki Outpost portal, the player must defeat Tyrant of the Skies at least once.