He remembered the first day how tried to use this technique without proper guidance.
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The first time he used this technique was quite hard to grasp as every living thing breaths Mana. In order to learn this technique one must control their lungs and heart beat.
'Lung Contraction and Relaxation by controlling Diaphragm up and down moments' After a series of research on monsters and dead bodies, It took him almost one month to control his Diaphragm.
After that,
'Control the Systole and Diastole of Heart to form a link between other soul crystals' Which was way harder than controlling the Diaphragm. He initially thought it impossible to human control their heart movement. But if there was a technique like this then might be possible so he tried it numerous times but all in vain as without guidance, he couldn't do it.
