"Is that the energy body (energy crystal)?"
Luo Yuan could tell as he read the introduction stated that was extracted from a heart.
In fact, the crystal Luo Yuan saw was totally different from the one he used to have The color and transparency was completely different. That one was taken from a flood-dragon from the green level, it was yellowish red in color and not transparent which looked like those stones we could see everywhere. While the one he saw online was slightly more yellowish and semi-transparent. No one would think it was the same thing even if they put it together.
However, one was from a level six’s mutated creature and another one was from level eight’mutated creature. Other than the difference from the outlook but the power was also very different. It would be very strange if it still looked the same.