The plan was simple, not easy.
Cradle was a large synthetic world. But even it was adversely affected by the sheer amount of vitality and divine power flowing out of the Fortune Anvil.
So much so that even the world had grown fragile. That's why it couldn't bear even the presence of rank 9s.
The world will had asserted to protect itself from destruction and evolved the world in a distinct direction.
That's the reason why there's a huge suppression in strength here.
If a Sovereign came here, he wouldn't be able to crawl. The density of aura here was so thick that it'd suffocate a rank 2 celestial.
The gravity, the rigidity of space, the tougheness of materials—everything was cranked up. It's amusing that it grew resilient to combat its fragility.
Even a world had a sense of self-preservance.
The point being that Cradle wasn't an easy world to explore.