The Four Great Powers

Yang Lingtian learned the relevant information from these people.

He learned that the Four Great Powers of Xuanning Domain were all sects with Peak Human God Realm experts presiding over them.

These four powers were Thunder Sound Sect, Leveling Heaven Sect, Vast Universe Sect, and Vast Heaven Sect—the four strongest powers in Xuanning Domain.

Ever since Deep Cloud discovered that Heavenly God's Grotto-Heaven more than a hundred thousand years ago, it had been controlled by these Four Great Powers.

In the grotto-heaven's core area stood a spatial divine hall, shrouded in an array formation.

Moreover, it was a peculiar array formation. Once subjected to a powerful attack, it would self-destruct.

Thus, no one had ever entered the divine hall in the innermost region. The Four Great Powers had no choice but to control it first.

However, outsiders were allowed to enter the areas beyond the grotto-heaven's core region, provided they paid a certain number of Top-grade Spirit Stones.

Yang Lingtian really wanted to know whether the so-called Heavenly God's Grotto-Heaven had been left behind by someone from the Chaos Sacred Sect.

Thus, he immediately flew away and soon arrived in the Deep Cloud Mountain Range.

At that moment, people streamed in and out of a valley, all hoping to enter the grotto-heaven and seek their opportunities.

Most of those who came were below the God Realm, while only a small number of Human God Realm experts had arrived.

Yang Lingtian did not act at once. Instead, he observed the area with his divine sense.

He saw a huge stone platform in the valley.

The stone platform was engraved with countless runes, radiating an ancient and mysterious aura.

Dozens of cultivators sat cross-legged around the stone platform.

Their eyes were tightly shut, as though they were comprehending something.

At the center