The True Immortal Great World was boundlessly vast.
Flying straight into the clouds, one would reach the Astral Wind Layer three thousand li up, where astral winds cut like blades.
Another three thousand li above the Astral Wind Layer lay the Thunderflame Layer, filled with roaring thunder and endless lightning fire.
Above the Thunderflame Layer lay another three thousand li of void turbulence.
Only after passing through the void turbulence layer would one reach the Endless Starry Sky layer.
The scale of the Endless Starry Sky layer abruptly expanded to hundreds of trillions of li.
Even a mighty Pure Yang True Immortal might fly for ten days and nights without reaching a single star, or even a meteor.
The space within the Endless Starry Sky layer contained all kinds of dangerous radiation. Though it could not harm Pure Yang True Immortals who had forged immortal bodies, it would still consume some of the pure yang immortal power within them.
In the Endless Starry Sky layer, not only was pure yang immortal power absent, even the world's primal qi was exceedingly scarce. Every bit of power expended was gone for good.
If they remained exposed to this radiation for too long, once their immortal power ran dry, the radiation would corrode their immortal bodies, killing them and extinguishing their Dao. Thus, beings who left the True Immortal Great World dared not leave themselves exposed to the Endless Starry Sky. Even after flying for dozens of days, months, or years, they would find a small world with a world force field...
Or rather, a world magnetic field, and stay there temporarily to escape the damage starry sky radiation inflicted on their immortal bodies.
The Nine Heavens Sacred Ground had done just that.
They occupied a small world some thirty billion li from