However, they do not rely on sharing Su Yu's Subspace Domain to upgrade like Nuonuo and the Mechanical Spirit.
The ascension of these Mechanical Souls also requires completing rituals!
And their rituals come in two forms.
One is quite troublesome, requiring them to perform complex rituals and endure arduous battles on the Subspace Domain Planet.
Just like when Su Yu was ascending to the Third Rank, it was a life-and-death situation.
Moreover, it's even more difficult than when Su Yu ascended to the Third Rank!
Back then, Su Yu's ritual required a month-long battle with the Brutal Split Mind.
The ascension ritual of these Mechanical Souls is even harder!
Because their evolution is the result of the Power of Time catalysis, they inherently carry backlash.
To normally ascend to the Third Rank is more difficult than the earlier Su Yu, nearly impossible.
