Defeat the Aizen/Manipulator boss associated with Hollow Island to farm Reiatsu Core. Available guides report a 3% drop chance, so you may need repeated fights; no fixed number of kills guarantees a drop. Guides use different names for the island, so check the in-game map and boss name before starting.
Where to find the Reiatsu Core boss
Reiatsu Core is associated with the Aizen or Manipulator boss. The Sailor Piece Wiki item page places the Manipulator Boss on Hollow Island. Other guides call the location Hueco Mundo, while a Game Guide Aizen boss page also identifies Aizen as a Hollow Island boss. The sources do not establish whether Hollow Island and Hueco Mundo are alternate names or reflect inconsistent guide information. Use the in-game map and boss name as your practical check.
How to farm Reiatsu Core
- Travel to the island where the Aizen/Manipulator boss appears, checking the current in-game map and boss label.
- Defeat the boss and check whether Reiatsu Core dropped.
- If it does not drop, repeat the fight. The guides report a 3% chance per attempt, not a guaranteed reward after any particular number of kills.
- Before farming toward a specific upgrade or weapon, check the current in-game NPC for the required materials and quantities.
The 3% figure is published guide data rather than an independently verified live drop table. It appears on the Fandom item page, in All Things How’s farming guide, updated March 26, 2026, and on the Game Guide boss page.
What Reiatsu Core is used for
Guides associate Reiatsu Core with Ascension 4 and the Manipulator Sword, also called Aizen Sword in some guides. Their listed core requirements differ by route:
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| Use | Guide-listed Reiatsu Cores | Source |
|---|---|---|
| Ascension 4 | 4 | All Things How, updated March 26, 2026 |
| Manipulator Sword | 3 | Game Guide sword page |
The sword listing is on Game Guide’s Manipulator Sword page. If you plan to pursue both, the listed requirements add up to seven cores, but confirm current costs with the relevant NPC before committing to that target; game requirements and guide pages can change.
How much health does the boss have?
Game Guide lists Aizen at 25,000,000 HP. Its page is undated, so treat that as guide data that may no longer match the live game rather than a confirmed current stat.
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