Having received the ten mana stones, Violet experienced immense joy as she glimpsed the possibility of easily ascending to rank B and even aspiring to rank A. However, she knew this advancement would not be as simple as simply absorbing the mana stones.
As mentioned above, when a mage reaches rank C, he faces two fundamental tasks to ascend to the next level. First, he must have a stable core with a large reserve of magical power, otherwise, he will be stuck at rank D. Second, it is to increase his understanding of his attribute through trial and error, a common process.
Violet had already fulfilled the first requirement: a stable core and a large reserve of magic power. In addition, she is already at rank C. And she reached this rank during the chaos in the city, provoked by the president of the Luminis guild.