Defeat the Aizen/Manipulator boss associated with Hollow Island—also called Hueco Mundo by some guides—to get Reiatsu Core. Published guides report a 3% drop chance, so you may need to repeat the fight; no fixed number of kills guarantees a drop.
Where to find the Reiatsu Core boss
Guides associate Reiatsu Core with the Aizen or Manipulator boss. The location is described inconsistently: the Sailor Piece Wiki item page says Hollow Island, while the All Things How farming guide also uses the name Hueco Mundo. A separate Game Guide boss page identifies Aizen as the Hollow Island boss. The sources do not establish whether these are alternate names for the same place or a guide inconsistency.
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Use the in-game map and the boss name as your practical checks rather than relying on a single island label. Game Guide lists the boss at 25,000,000 HP; that is guide data, not a confirmed live stat, and may change.
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How to farm Reiatsu Core
- Travel to the island where the Aizen/Manipulator boss appears, checking the in-game map and boss name.
- Defeat the boss and check whether Reiatsu Core dropped.
- If it did not, repeat the fight. Guides report a 3% chance per attempt, not a guaranteed result after a set number of kills.
The 3% figure appears on the Sailor Piece Wiki, the All Things How guide, updated March 26, 2026, and Game Guide. These are published guide figures, not an independently verified live drop table.
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What Reiatsu Core is used for
Guides associate the item with Ascension 4 and the Manipulator Sword, also called Aizen Sword by some guides. Their listed quantities differ by route:
| Use | Reported Reiatsu Core requirement | Source |
|---|---|---|
| Ascension 4 | 4 | All Things How, updated March 26, 2026 |
| Manipulator Sword | 3 | Game Guide |
Seven cores would cover both routes only if you pursue both and the listed requirements have not changed. Check the relevant in-game NPC before farming toward a target; All Things How also lists other Ascension 4 requirements, including a Blood Ring.
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