Zhou Luan adjusted her state. "Daoyuan, I'm about to undergo tribulation. Stay farther away."
Wang Daoyuan nodded and flew beyond the area covered by the dark clouds.
The tribulation clouds continued expanding, soon reaching a diameter of three thousand miles.
For a Spirit Transformation heavenly tribulation, tribulation clouds of this scale were already as rare as phoenix feathers and qilin horns.
Tribulation clouds reaching five thousand miles, like Wang Daoyuan's had, were a once-in-ten-thousand-years phenomenon.
After the tribulation clouds stopped expanding, a vortex appeared at their center.
The same had happened when Wang Daoyuan underwent tribulation. The Heart Demon Tribulation would emerge from that vortex.
The vortex churned for a long while before dropping a black sphere.
Wang Daoyuan was naturally no stranger to this sphere. He had encountered a similar one during his own tribulation.
Only, his heavenly tribulation sphere had been as wide as a millstone, while this one was barely over a foot across.
The sphere floated above Zhou Luan's head and released a powerful suction force.
Very soon, Zhou Luan's Nascent Soul involuntarily left her body, and the sphere instantly enveloped it.
Wang Daoyuan did not dare probe the situation beneath the tribulation clouds recklessly, so he had no idea what Zhou Luan's illusion was like.
Only wisps of black qi continuously leaked from the black sphere.
Freed from the sphere's restraints, the black qi became violent.
The surrounding yellow sand was swept up by the black qi, forming an enormous sandstorm.
Even the nearest oasis was twenty or thirty thousand miles away.
No matter how strong the black qi was, it could not possibly affect such a distant place, so Wang Daoyuan paid the sandstorm no heed.
Tribulation clouds spanning several thousand miles naturally alarmed quite a few cultivators.
Yet they could all sense that