It was hard to see a higher grade demon in the Abyss Blood Pool.
Basically, as long as the Depths Worms born here reached the edge of the advanced grade, they would automatically leave this place to look for other advancement opportunities. Most of the surviving Depths Worms would be advanced to be [Dretchs]. Occasionally, Depths Worms could evolve by chance. Only a few of them would keep their original appearance and further increase their strength. All demons were capable of growing stronger. The Bottomless Abyss was never short of demons who hated new forms and refused to advance or transform.
For example, the Abyss Blood Pool in front.
There was a powerful demigod demon - [Mother of Worms]!