Lu Ye's understanding of the division of Dao Realm cultivators' strength all comes from Cover Armor stellar space, and the intelligence from Cover Armor stellar space is gathered from years of exploration and contact with Star Abyss cultivators, along with some speculation.
According to the intelligence collected by Cover Armor stellar space, 9th Dao is considered the ultimate because nine is the extreme number, so there's unlikely to be 10th Dao or 11th Dao experts...
But now it seems that things might not be like this.
Moreover, the classification of Star Abyss cultivators' levels is not well understood by Cover Armor stellar space, because for hundreds of years, the enemies they've encountered were at best around the 7th or 8th Dao.
However, this may explain why the 8th Dao expert from Cover Armor stellar space lost contact after attacking Star Abyss.
It's evidently because there are beings stronger than the 9th Dao in Star Abyss. An 8th Dao wouldn't be enough.
