The Ivan Nether energy is inherently the 'energy' of all creatures, including humans, that have a division between male and female.
Among humans, males possess innate 'Yang energy';
Among humans, females possess innate 'Yin energy'.
"According to the information in the Jade Slip: near the entrance to this small world, as soon as a creature with 'Yang energy' and one with 'Yin energy' appear within a kilometer of each other, space turbulence will occur, sweeping both into the small world…"
"Even if one party is human and the other is a beast… it will still happen."
"However, if the creature is non-human, it will be immediately exterminated in the process of being swept into the small world by space turbulence!"
"As for humans, though they can enter the small world, once inside, if there is no person of the opposite gender beside them, they will trigger the 'reversal array' within the small world, thereby inviting the death trap and perishing!"
