Lucifer stood still for a moment, his crimson eyes narrowing in thought. He looked down at his own abdomen as if expecting to see the "mana core" pop into view. Of course, it didn't.
Leone, noticing Lucifer's curiosity, added, "You won't be able to sense it unless you actively focus. It takes concentration and calmness. Close your eyes, my lord, and allow your mind to see your inner self with calmness."
Lucifer gave him a sidelong glance but decided to do it anyway. "Fine. If this blows up my inside, remember you are the next," he muttered before closing his eyes.
He slowed his breathing, steadying his nerves, trying to sense his inside (oh no, that was not me, I promise). He sensed a chaotic flow of mana in his veins. For someone like him, who had used mana like water in his body, it was everywhere. This was the first time he had been so calm and sensed his mana like this. He felt almost alien to this feeling.