The Reiatsu Core is a crucial item in Sailor Piece, especially for players looking to progress through the Ascension system. However, getting it can be quite challenging due to its low drop rate and limited source. In this guide, we’ll break down exactly how to get Reiatsu Cores and the best way to farm them efficiently.

What is Reiatsu Core Used For?

Reiatsu Cores are required for Ascension Level 4, which is a major progression milestone in the game.

To complete this level, you’ll need:

  • 4 Reiatsu Cores
  • Additional materials (depending on your progression)

Ascension Level 4 Rewards

Once completed, you’ll receive permanent buffs such as:

  • +10% Gems
  • +10% Money
  • 2% Cooldown Reduction
  • +5% Luck

These buffs make a big difference in both farming and combat, and also unlock further Ascension stages.

Where to Get Reiatsu Core

Where to Get Reiatsu Core

Reiatsu Core only drops from one boss:

  • Boss: Aizen
  • Location: Hollow Island
  • Respawn Time: ~5 minutes

This is the only way to obtain the item, so all your farming will be focused here.

Tips to Defeat Aizen Faster

Farming efficiently isn’t just about luck, it’s also about how quickly you can defeat Aizen each time he respawns.

Here are some useful tips:

  • Use high DPS builds
    Focus on abilities and weapons that deal consistent damage rather than burst-only attacks.
  • Stay mobile during fights
    Aizen can deal heavy damage, so dodging and repositioning will help you survive longer.
  • Bring strong AoE skills
    These can help you clear any additional enemies around quickly and focus on the boss.
  • Play with other players
    Fighting Aizen in a group makes each run faster and safer.
  • Reduce cooldowns
    If possible, use builds or buffs that lower cooldowns so you can spam abilities more often.

Drop Rate Explained

The Reiatsu Core has a very low drop rate of around 3%.

This means:

  • You likely won’t get it in just a few runs
  • Multiple boss defeats will be required
  • Patience and consistency are key

Best Way to Farm Reiatsu Core

The most effective strategy is simple:

  • Stay on Hollow Island
  • Defeat Aizen every time he respawns
  • Repeat the process until the item drops

Since the drop rate is low, consistency is more important than anything else.

How to Increase Drop Chances

While the base drop rate is low, you can improve your chances by boosting your Luck stat.

Ways to Increase Luck

  • Fortune Rune → +15% Luck
  • Destiny Mark Title (Defeat 2,500 bosses) → +40% Luck
  • Kitsune Race → +25% Luck

Stacking these bonuses can significantly improve your chances of getting a Reiatsu Core faster.

Farming Reiatsu Cores in Sailor Piece is all about persistence. With only a 3% drop rate, you’ll need to defeat Aizen multiple times, but thanks to the quick respawn, it’s a manageable grind. Focus on increasing your luck and staying consistent, and you’ll eventually collect all the cores needed for Ascension Level 4 and beyond. For more detailed guides on progression, items, and farming strategies, check out our complete Sailor Piece Wiki.