"From what I know, the differences between a low, intermediate, high, and peak grade hell stone is the crystal itself and most importantly, the flame."
Simon turned the hell stone in his hand and observed it with a curious gaze.
It was slightly warm, and even as he held the hell stone, the passive stage of Devour was absorbing the demonic energy in it.
"A low grade hell stone has an uneven shape with chipped edges. It's rough and also cloudy, and the flame in it is a small, flickering dull red flame."
He paused, then his eyes flickered slightly.
"An intermediate grade hell stone is clearer and more symmetrical. It has smooth edges, and the flame is stable and has a darker and brighter colour."
"It moves naturally and emits no smoke unlike a low grade hell stone."
He paused, then he began moving the hell stone in between his fingers.
"And for a high grade hell stone, that's where things begin to change."
