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Endgame IslandsLv. 6250+

Shinjuku Island

Cursed ruins at level 6250, home to the Strongest of Today and Strongest in History summonable bosses. Features the high-level mastery system and one of the best endgame training spots.

Overview

Level Requirement
6250+
Sea Region
Endgame Islands
Bosses Available
2
Last Updated
March 30, 2026

Bosses on Shinjuku Island

B

Strongest of Today

Located on Shinjuku Island

B

Strongest in History

Located on Shinjuku Island

See the Bosses Database for detailed boss stats, drop rates, and strategies.

Activities & Features

Strongest of Today boss (requires Limitless Key from Gojo)

Strongest in History boss (requires Malevolent Key from Sukuna)

High-level mastery system

Strongest in History fighting style trainer

Hogyoku Fragment #4 (needed for Soul Society access)

Tips for Shinjuku Island

This is endgame content (level 6250++). Come prepared with a fully upgraded sword, Conqueror Haki, and a strong clan. Underpowered players will struggle significantly.

Shinjuku Island has 2 bosses: Strongest of Today, Strongest in History. Check the Bosses Database for exact HP, drop tables, and spawn timers before farming.

This island has a Hogyoku Fragment — one of 6 needed to unlock Soul Society. Collect it as you farm here to progress toward the Hogyoku Quest without a dedicated detour later.

Every island has a teleporter (black-hole shape with a purple ring). Use it to fast-travel between islands without spending time sailing.

Tags

endgameboss-summonmasteryfighting-stylehogyoku

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Shinjuku Island — Info

Level
6250+
Sea
Endgame Islands
Bosses
Strongest of Today, Strongest in History
Activities
5
Updated
2026-03-30