Chapter 421: The Chains That Seal

William probably wouldn't have noticed the Mana if not for his Cultivation, which enhanced his vision to exceed a thousand kilometers at the Soul Formation Realm. As he used the Earth Element to dig underground and inspect the familiar Mana closely, William suddenly had a realization.

System, is what I'm thinking true?

-Most likely. I'm only ninety-five percent confident, though.

William nodded, not bothering to question the missing five percent. He continued to tunnel underground, even passing through layers of molten lava until he neared the edges of the World's core, where he was eventually met by a thick wall of Mana that resembled both the wall of Soul-Sapping Necrotoxin in the Velos Continent and the rays of Mana that connected the Greater Elemental Veins to the Superior.