And that single fireball had actually drained all the natural mana he had accumulated over two hours in one go?
At that rate of consumption, even with a fully charged crystal, he could only cast three Little Fireball Spells... And this was the lowest-level Black Magic. Did all Black Magic consume such terrifying amounts of mana?
Mu You frowned in thought for a moment, then shook his head.
He felt the problem was still that he had not mastered how to control its power. The secret art practitioners in his memories fought fluidly in every battle, casting all kinds of secret arts with ease. They could unleash them one after another like a barrage of cannon fire, with every spell controlled to perfection.
Take that fireball (Flame Explosion), for instance. There had been no need to make it so powerful. Enough force to seriously injure the enemy would have sufficed, and the mana saved could have been used for other things.
From that perspective, he would only have truly grasped the basics of Black Magic when he could control its power as freely as those secret art practitioners, unleashing or restraining it at will.
"Still plenty of practice ahead..."
Mu You sighed, shook his head, and tried the other spell, "Rejuvenation."
After he finished chanting, the skin he was wearing changed back to the Night Watchman's ten-year-old form. His height abruptly dropped to a meter and a half, his build became considerably thinner, and his complexion grew much fairer. His clothes hung loosely on him.
What surprised Mu You was that after changing his age, he discovered that some of the scars originally on his body had disappeared as well.
"Does Rejuvenation heal injuries too?"
An idea struck Mu You. He hurriedly pressed the Pocket Watch, returning to before he