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
Strongest of Today
Located on Shinjuku Island
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.
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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