"It worked..." Leon frowned. "I see... it is a skill that increases my stats as long as don't let my feelings control me. It is quite complicated to level up since I can't get emotional in any way."
It looked it was a skill that could only be learned during a battle, and it had a lot of requirements such as attacking and defending without thinking about anything... to some extent. If one stops from thinking, one wouldn't be able to react or attack, after all. Regardless, Leon wondered if he could level up that skill while using magic... he had no choice but to test it.
" I guess since it only can be learned in combat... then I can only level up the skill in combat too."