A way to manipulate her mana so that it could perform as a unifier between her elements.
She could now wield the element of nothingness, but only in its purest form. It was the most basic form, where she literally took it from her being's essence itself.
She hadn't gotten to the stage where she could freely manifest the element from her surroundings. Estelle's brows creased back and forth as she made her way into the intricate parts of her supposed plan.
It was to create a type of mana- a variant form. The basis would obviously still be her own mana, but the characteristic and type would be slightly altered. To be one that could hold both the element of nothingness and her Creation Magic.
First, she had to create the medium for the exchange.