Each Black Tower is a 'Top-Grade Heavenly God Artifact', and the might of the eighteen Black Towers united is terrifying... almost reaching the level of a Top-Grade Heavenly God Artifact.
"The Black Light Realm Tower is a set of Sealing Divine Artifacts." Li Yuan nodded slightly: "It contains two major secret techniques: 'Black Light' and 'Sealing World', each of which has three layers."
"With 'Sealing World' as the core, one must completely comprehend the world of Space Law to trigger the Third Layer. If the divine power is strong enough... even a Fourth Rank Heavenly God can be sealed under it." Li Yuan thought to himself, "This is definitely a treasure suited for a powerful Heavenly God."
The ability to completely comprehend the world of Space Law indicates that one's Law Comprehension has reached the 'Eleventh Rank', which is generally attainable for a Fourth Rank Heavenly God.
As for 'Black Light'.
