How to Unlock and Defeat Sea Prisoner in NTE (Deep Blue Sorrow)

Sea Prisoner is a world boss in NTE: Neverness to Everness that is the subject of the Deep Blue Sorrow Anomaly Commission located in the New Herland District in Hethereau City. Locating the boss arena of the Sea Prisoner boss for the first time can be tricky, as it requires players to drive a 4-wheel vehicle down a specific road, but the game does not outright come out and tell the players that this is what they need to do, leading to some confusion.

This guide covers the exact method players can use to find the Sea Prisoner boss, as well as how to defeat it to complete the Deep Blue Sorrow anomaly commission.

Sea Prisoner Boss Encounter in NTE Overview

1. Purchase a car in NTE.
2. Drive the car into the Nautili Tunnel that connects Bridge Crossing and New Herland District using the eastern entrance.
3. Enter the anomaly in the tunnel and follow the road until you reach the Sea Prisoner boss arena.
4. Defeat the Sea Prisoner and “Comfort” it to complete the Deep Blue Sorrow Anomaly Commission.

Sea Prisoner Boss Location in NTE

Deep Blue Sorrow Anomaly Commission

• Requirement: Car (4-Wheel vehicle)

Track Deep Blue Sorrow from the Anomaly Commission menu (bottom right icon on the map).

Fast travel to the Bridge Crossing Wertheimer Tower and head south to reach the main road (Coastal Highway Z42).

Summon your car by using the Key Fob on the roadside.

Drive the car into the underground tunnel in a straight line until the Deep Blue Sorrow anomaly appears.

Enter the anomaly and drive on the water path and the ice path until you eventually reach the Sea Prisoner’s Boss arena.

How to Defeat Sea Prisoner in NTE

Phase 1

• The Sea Prisoner is weak to Anima damage, which means characters like Mint, Jiuyuan, and Nanally hard counter this boss.
• The best window of opportunity for getting the most damage in is when the Sea Prisoner jumps up and then drops down into the water before slowly coming back up.
• The Sea Prisoner will occasionally jump up in the air and send multiple balls of red water towards you. Avoid these using dodge.
• When the boss dives underwater and a vortex appears under your feet, prepare to dodge to trigger the i-frames to avoid damage when the whale comes back up from directly underneath you. While it is possible to outrun this attack, the suction force and the water spouts that erupt around the vortex make this difficult.
• Occasionally, the Sea Prisoner will create a vortex underneath you to trap you in place and then approach in a straight line in order to ram you headfirst. Parry this attack by using any Redirect Skill, Ultimate, or Basic Attack when the boss comes near you to perfectly counter this move and get some free damage in.

The best team to defeat the Sea Prisoner consists of Nanally, Jiuyuan, Sakiri, and Zero (MC), but any decently built team will do.

Phase 2

• When the Sea Prisoner is brought down to half health, the sky will go dark, it will start raining, and phase 2 will trigger. In this phase, Sea Prisoner will become more aggressive and gain access to some new attacks.
• Sea Prisoner will throw a bright red anchor at you in a straight line from high above. Avoid it using dodge.
• The boss will create multiple tsunami waves of red water and direct them toward you. Do not run away from these attacks, but rely on dodging to i-frame the damage because the timing is very generous.

Sea Prisoner Boss Rewards in NTE

Deep Blue Sorrow Anomaly Commission Rewards

After the Sea Prisoner is defeated, you’ll receive the following rewards:

• 52 Hertz Achievement
• New Herland District Footprint Points +32
• Hunter Level EXP x300
• Annulith x40
• Anomaly Material Selection Box I x5
• Silver Corrota x80
• Fons x15,000
• U-00NE x30
• Beetle Coin x7,500

Before leaving, don’t forget to interact with the blue anchor in the middle of the arena to obtain the Song of the Whale S-Rank Arc.

After you beat the Sea Prisoner once, you do not need to go through the underground tunnel again to fight it a second time. A whale-shaped icon will appear in the southeastern part of the New Herland District, which you can teleport to in order to trigger a fight against the Sea Prisoner as many times as you want.