Think

"One of you already has them, but the other hasn't formed them."

"Huh?!" Both Annas were dumbfounded by that hint. On the one hand, they thought they were the ones who had it. On the other hand, two of them had been developing in a different kind of situation. So, they didn't know which one had formed them.

Still, the original Anna didn't think she had created something, since the only thing she did was learn how to control her lightning according to the Thunder Berserker Spirit.

So, the one who might have formed them was Anna. 

The moment she came to the realization, the original Anna looked at her with envy. That expression was the only thing that Anna needed to finally understand the spirit's words. 

"Don't tell me… Spirit Practitioner all the way to Spirit Grandmasters? I mean, the power that's given to each stage?" Anna gasped.