678. Heart Demon World, Heart Demon Great Method

"No need for any pleasant surprises."

"You Evil Clan from Outside the Realm came running into the territory of my Great Thousand World to run wild, and even bullied my teacher. We'll be settling that score properly today."

Xiao Yan smiled faintly, his fingers gently rubbing the Heavy Black Ruler before him. His smile was lazy, but there was not the slightest warmth in the depths of his eyes.

"Settling scores?" Demon Emperor Xuanxin burst into wild laughter. Demonic Qi around him suddenly surged, and the sky-blotting Demonic Qi once again swept through heaven and earth. "With you? This Seat admits that your talent is indeed formidable, but in the end, you are only a Spirit Grade Heavenly Sovereign! The chasm between Immortal Grade and Spirit Grade is not something talent can easily smooth over!"

"Today, This Seat will let you see the true power of a Emperor Xuan Mo!"

As his words fell, Demon Emperor Xuanxin took a fierce step forward. In an instant, black ripples, like enormous waves, swept madly out from beneath his feet!

"Heart Demon World!"

A thunderous shout resounded through heaven and earth. With Demon Emperor Xuanxin at the center, the earth and volcanoes within a radius of hundreds of thousands of li began turning pitch-black at a speed visible to the naked eye.

Thick, ink-like Demonic Qi continuously rose from the cracks in the earth. Wherever it passed, grass and trees withered instantly, and mountains and rocks turned into rotten soil. In just a few breaths, the land within hundreds of thousands of li had been completely transformed into deathly silent demon soil.

Everyone could sense that within that hundreds-of-thousands-of-li region, even the Spiritual Energy between heaven and earth had been thoroughly tainted by demons at that moment.

If a cultivator carelessly inhaled that