The capability of a Primordial wasn't to be underestimated as if she said she would do something…more than likely she would do it in a grand fashion.
The Primordial Europa claimed that she would forge the Archaic Ancestral Treasure Dimension, and so she would as she was an existence that kept her word!
Noah wanted to challenge and exceed himself in what he could do as his confidence rose, and he utilized the unique mindset of this Primordial to create a unique scenario where even the Champion this being made did not know what would be happening.
Even the Champion of Reality…did not know that the Primordial above him would actually play games like this as it was a terrifying concept to think about!
"Haha, let's prepare the stage! I'll collect all the powerful archaic beasts dwelling throughout these Cosmos and then…"