Lance had not intended to concern himself with the affairs of the Abyssal Netherworld, but upon seeing the Soul Reapers of the Abyssal Netherworld, he suddenly felt that allowing the Demon Race of the Abyssal Netherworld to expand and act recklessly would defile the sacred existence he held in his heart.
As he told the story, he never thought the Demon Race would bring the "Underworld" from his tale into reality.
He had known before but hadn't cared, because the Abyssal Netherworld wasn't his creation, and naturally, there was no need to concern himself with this existence that was an enemy of Hell.
Moreover, in his memory, an existence like the Abyssal Netherworld would eventually be annexed by Hell.
The Abyssal Netherworld would naturally fade away.
Now, it seemed he had overthought things; the power of Hell on this side of the abyss was still unable to easily destroy the Abyssal Netherworld.