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"Look here," removing his glove, he spread out his right palm, and under my curious gaze, a white orb covered with dark mist the size of a marble condensed. Within that tiny ball of light, I could feel a tremendous energy. 

Wow. 

"This is concentrated mana. It may look tiny but this size has already a destructive power. It can kill a person directly." His smile at that moment has a hint of devilishness in it, "and can be a powerful bomb," he added.

A what? A bomb?

Lukas wasn't finished yet, apparently.

"Of course, if you have absolute control of it, you could make this even bigger." 

And then the tiny marble-sized orb began to expand, growing bigger and bigger until it was the size of a human head, and it didn't even stop there, it grew further. I had even leaned back, all the while transfixed over it, overwhelmed by the sheer energy it was giving.