"Yes, as long as Daoist Monarch Soul Devourer protects us across the Netherworld, no matter how much creation my Heavenly Corpse gains inside, I will owe you a favor in the future!"
Heavenly Corpse True Monarch was the second to speak up; among everyone, he was actually the easiest to cross the Netherworld. He could completely use a Yin Corpse to shield himself, carrying himself across the Netherworld.
However, doing so might render the Yin Corpse he sacrifices obsolete after crossing the Netherworld, making its combat power within the Inner Circle far inferior to other True Monarchs.
It would be better to follow Daoist Monarch Soul Devourer, and once inside the Inner Circle, use Divine Skills to seek out various Great Tombs. As long as he finds some Yin Corpses in these tombs to start refining, even if he hasn't entered the Vientiane Realm, he could still roam the Nirvana Realm with the formidable Yin Corpses!
