Kasu Kasu no Mi

Introduction
The Seigen Seigen no Mi is a Paramecia devil fruit that has so far not shown up in the fan fiction Shells.

Appearance
The fruit's appearance is so far not known.

Usage
The user can break the limits set on them as a human being under pressure, which can result in multiple effects.

Strengths
The user can become stronger, faster, and smarter the more they push themselves. This can become useful during any situation since the user can use this ability whenever they try to.

Weaknesses
The user can only push their limits when injured, however. The user is not able to push their limits for no reason, forcing the user to only be able to become stronger and faster under the influence of pain. The user also suffers from standard Devil Fruit weaknesses.

Attacks
There are so far no named attacks.

Trivia
I don't know.