The crystal trembled for a moment and then came to a stop, with no further changes. Chen Fei tried to increase his elemental force, but aside from keeping the crystal trembling, the result remained the same.
Chen Fei's expression shifted slightly. The world's elemental energy nourishes all things, and elemental force is derived from refining this energy. Therefore, most things react to elemental force in some way.
Even those specialized mystical tools designed for peculiar uses, powered by elemental force, can still be influenced by it, although their practical effects may not be very good.
After some thought, Chen Fei decided to use his own mental power instead.
The crystal began to emit a faint light, and the frequency of its tremors wasn't strong, but a strange aura began to emanate from it.