After Vaan introduced Marchioness Belline and her two daughters to the pure mana-enriched land of the subterranean region, they were immediately spellbound by its unimaginable purity.
It only took them a brief moment of contact to realize how easily they could control pure mana.
They were greatly shocked to discover such simplicity of control was even possible.
Nevertheless, after they settled down and started absorbing pure mana from the surroundings for their cultivation, they were quickly immersed in it and forgot about everything else.
As such, Vaan quietly left so he wouldn't disturb them. How much they could achieve would depend on their effort and talent.
Meanwhile, many High Witches from the first batch of battle witches had already reached the Peak-stage High Witch rank after their full week of cultivation. Some even managed to reach Half-step Transcendent Witch rank.