After mastering alchemy, Leon indeed refined quite a few mana restoration pills.
Because refining those pills required many rare alchemy materials, over the years, Leon had hardly ever taken any… On one hand, there were no strong enemies, and on the other hand, he somewhat had a hoarding problem, often saving potions while playing games before crossing over, never drinking them even at the end.
If it weren't for that Flame Divine Successor being too strong, overwhelmingly so, a pressure he had never felt in front of the Kraken and Ancient Black Dragon Delaguna, dizzying him for a while, he wouldn't be willing to take the medicine either.
The cost of these pills alone was several tens of thousands of Gold Coins; this wasn't just taking medicine, it was consuming money. Leon felt his heart bleeding, hoping he could finish off that Flame Divine Successor before the pills ran out, or he'd suffer a great loss.