C21 Fast and Merciful(2)

There are some elements that cannot be applied directly to attack or defense, but they are very useful. For example, when Clot comprehended the 'kindness' of light and immersed himself in the 'kindness' of light, his soul power grew rapidly.

Therefore, ever since he discovered this characteristic, Clot had used the 'kindness' of light to quickly recover his soul power