# Concentrated Boss Crystal

**Item ID**: 8904
**Type**: Currency
**Grade**: Blue
**Weight**: 0.1 LT
**NPC Buy**: 100,000 silver
**NPC Sell**: 10,000 silver
**Notable**: yes

## Flavor

A crystal bearing the concentrated essence of boss. Its power can be used to draw out the potential of special gear.


## Usage

Craft Resplendent Boss Weapon/Armor Reform Stone




## Obtain

Defeat boss, complete [Weekly] Imperfect Beings, or via Latent Boss Aura exchange (available at all times)


## Notes

※ Resplendent Boss Weapon/Armor Reform Stone is used in Guaranteed PEN (V) Enhancement.


## Used In


- [Black Crystal](/item/4470.md)

- [Blue Crystal](/item/4483.md)

- [Green Crystal](/item/4469.md)

- [Oquilla Earth Crystal](/item/8903.md)

- [Oquilla Sky Crystal](/item/8902.md)

- [Red Crystal](/item/4468.md)

- [Rough Diamond](/item/4405.md)

- [Rough Emerald](/item/4404.md)

- [Rough Ruby](/item/4401.md)

- [Rough Sapphire](/item/4402.md)