The first method was to bring his Self-World into full manifestation.
However... this method could not form a domain, because to the True World, Qin Hao's Self-World was Illusory Void.
Of course, that was from the True World's perspective. From Qin Hao's perspective, his Self-World certainly could not be Illusory Void. On the contrary, it was utterly real.
Precisely for that reason, Qin Hao could freely enter his Self-World, and could even guide others into it.
In fact, this was the same as other people's Inner Worlds. Qin Hao could also enter other people's Inner Worlds, and both a Self-World and an Inner World could greatly enhance the strength of the person who controlled them.
An enemy's strength, meanwhile, would be suppressed.
This was one method of manifestation. With this method, Qin Hao could even superimpose his entire Self-World upon the Heavensea.
Qin Hao had been able to do this easily back when he was still in the sovereign realm. Even the first time he underwent his tribulation to advance to the sovereign realm, he had done so inside his Self-World.
As for the other method of manifestation...
It manifested in the form of a Heaven and Earth Domain. What made it completely different from the first method was that this method of manifestation...
Was meant to make it real.
It was no longer Illusory Void, nor did it lie somewhere between Illusory Void and reality.
This was also what made a Heaven and Earth Domain so terrifying. It required an Inner World to merge with the True World, forming a true domain with utterly terrifying power.
Imagine a Heaven and Earth True God suddenly manifesting a domain during battle. Within it, every enemy would suffer a drastic reduction in strength, while that Heaven and Earth True God's strength would