Although Leon was still hesitating in using blood as a means of attack, using it his own could surprise his enemies in life or death situations. So, that was why Leon thought of another skill to solve one problem that bothered him since the moment the monsters appeared. It was his weight loss whenever he recovered from a significant injury.
"While relying on recovery and simple healing spells alone, I can't counter those after effects," Leon said. "But considering that mana can create anything, then perhaps there is a way to create potions that heal my wounds without making me lose weight."
The easiest option would be to create a potion using Mind Summoning. Even though Leon could create potions using that, he couldn't make a potion that could recover his blood and restore his damaged flesh without understanding the logic behind it. The first step was to learn how to create such a potion. After that, Leon would be able to mass-produce if he wants using Mind Summoning.