Chapter 506: Chapter 274: Undercurrent Surges, Indestructible Golden Bones

Red Moon Demon Sect, Goddess Peak.

Lu Yun calmly raised his right hand, revealing a gigantic spirit core in his palm.

On the outside of the spirit core, an incredibly dense dark energy emanated, causing the surrounding space to distort slightly.

This spirit core was taken from the brain of the demon that Lu Yun had killed last in the Blood Slaughter Secret Realm.

This dark energy was extremely powerful, and the violent aura it emitted made people feel uncontrollably agitated.

Lu Yun carefully studied the spirit core as the White Lotus Flame enveloped it.

"I hope the spiritual power within this spirit core can greatly boost my Martial Arts Will."

It took almost an hour for the White Lotus Flame to refine the dark energy on the surface of the spirit core, leaving behind an extremely pure essence of spiritual power.

"As expected of a demon with strength comparable to the Golden Core Realm, it has increased my Martial Arts Will by 50 percent in one go."