The rolling black air and infiltration of devilish intent were degenerating and filthy forces for deities and Buddhas, but made the Demonic Monarch feel comfortable all over. His consciousness seemed to spread continuously, exploring into countless universes like an attacking octopus absorbing all negative emotions and all killing nutrients.
"If only the universe was a boundless sea..." the Demonic Monarch sighed, turning a blind eye to the either vague, hideous or strange figures in the surrounding darkness. If these spirits and demons misbehaved, they would only become his blood.
Just the endless sea formed from the demonic air leaked out of the Netherworld was already able to make him feel that his injuries were recovering and his power was nearing the peak. If he really stepped into the real Netherworld, he would probably not just reach the peak but make a huge progress to reach perfection, or even come into contact with the characteristics of the Nirvana realm.