The Sexy Queen
Arthur stayed his place for days while absorbing everything he could from this world and hitting the bases higher constantly.
"My old core formation stage had around nine stages, but I think my core is different. It's three cores not just one after all," he thought after raising a couple of bases already and feeling himself getting stronger.
The number of stages in each major base was universal back in his days, and that was thanks to the fixed nature of every core of each base. For example, the current core formation stage had nine stages in it based on the shape of the core and the time needed to condense and purify it.
To transform the core into a nascent soul it took around nine steps before the final jump in the end. But right now he had three of the top cores he ever heard about, and so he hypothesized his own core formation stage would contain more minor stages.