High Step King's Consciousness Projection

"As expected of a Blood Demon Crystal, it ameliorated my spirit body a little even though it's at the peak of the fourth step. Unfortunately, a low level crystal can't take it all the way to the fifth step."

The higher one went, the more difficult it became to strengthen the spirit body. A low level Blood Demon Crystal was still useful for Ye Chen as it further refined the essence of his spirit body. However, upon reaching the fifth step, it would have no use whatsoever. This was because his body's resistance would be enough to completely nullify the effect of Blood Demon Crystal, just like repeatedly taking a medicine would nullify its effect on the body.