This was an ancient world of thunder.
Rumbling thunder constantly rolled across the sky as bolts of lightning slithered through it.
The entire space was filled with incredibly violent spiritual energy, teeming with life.
Hundreds of years ago, the Northern Heavens Spiritual Academy's Guardian Beast, the Northern Abyss Dragon Kun, had used its divine beast body to carve out this independent plane from the void, filling it with the power of thunder.
It had also gathered Black God Lightning from all around and cast it into the Thunder Sea, transforming the secret realm.
It had hoped to nurture an unrivaled Treasure Pill and thereby break into a higher realm.
Unfortunately, instead it had given rise to a Thunder Spirit, an evil creature with a will of its own. It had grown too powerful to control, and could never be completely eradicated.
Fearing the consequences, the Dragon Kun had become increasingly hesitant.
As a result, the Thunder God Pill had been taking shape for a century, yet it still couldn't be harvested, and the Dragon Kun's cultivation had stagnated.
But for now, none of this had anything to do with Mu Chen.
Breaking the seal on his Eight Spirit Veins had helped him immensely, sending his cultivation speed soaring.
That only made him covet his still-slumbering Nine Divine Veins even more.
What kind of cultivation speed would he achieve if he combined the Eight and Nine Divine Veins?
Back at Ling Xi Courtyard, Mu Chen had asked his adoptive mother about the secret to unsealing the Nine Divine Veins. Until then, he'd been completely clueless.
Even the Spiritual Array master had been powerless against the work of his teacher.
After some research, she'd told Mu Chen that perhaps he could slowly wear down the Spirit Array and break the seal with