Its body was too large, making transformation difficult. It probably wasn't real.
However, spiritual roots that could not transform due to certain reasons did exist. For example, the ten supreme innate spiritual roots—some were even Chaos spiritual roots.
These spiritual roots could not transform and could only continue existing in the form of spiritual roots.
Of course, spiritual roots capable of transforming were no longer called spiritual roots. They were called plant demons.
As for spirit beasts unable to transform, there were quite a few of those. The root cause was simply that their cultivation was too weak. Once their cultivation was sufficient, transformation would come naturally.
But then again, in the original Primordial World myths, that Black Tortoise of the North Sea indeed seemed never to have transformed. In the end, because of its immense size, Nuwa cut off its four legs and used them as pillars to support the heavens. It really was rather tragic.
After Nuwa Repairs the Heavens, that Black Tortoise was killed off and had no further role to play. As for whether it was eventually reincarnated, and who it reincarnated as, that had always remained a mystery.
It was common for spiritual roots to be unable to transform because their foundations were too profound.
But spirit beasts...
Although he had never seen a spirit beast that was too powerful to transform, perhaps that old tortoise was a living example? Perhaps, like those spiritual roots, its foundation was simply too deep, making transformation difficult for the time being.
And wasn't the Black Tortoise's immense foundation reflected in its size?
Its four legs could serve as stone pillars supporting the heavens. That showed just how enormous it was.
In the Northern Darkness there was a fish, named Kun. The Kun was so vast that no one