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Ren also improved the Calm Spirit Technique.
Previously, it required chakra to be converted into something that had calming properties. At most, it helped the practitioner stay level-headed, especially in the middle of a fight. But since this technique was only a level above the basics, it didn't really provide much boost.
It's useful to teach beginner martial artists more about chakra control and chakra property changes. Its actual effects were minuscule.
Ren changed in a way similar to what he did to the Green Lotus Core Technique and the Golden Fleece Technique 1.0. He overhauled the chakra conversion formula and the chakra attribute formula as well. He made it so that practitioners could create a Calming Spirit Chakra ahead of time, which mostly went to an individual's psyche, allowing its calming effects to last longer.
