Several hours later,
Opening her eyes, Beatrice couldn't help but take in a deep breath, compared to usual, after this round of refining mana, Beatrice felt much more tired.
Looking at the cause, the dozen or so rocks that were strewn on her bed at the moment, Beatrice couldn't help but take in a deep breath.
Without saying any words, Beatrice jumped up from the bed and walked in her experiment room.
"Go out and don't enter this place until I tell you," said Beatrice as she looked at Christian, who was silently standing in a corner of the room, without saying any words, merely taking some deep breaths.
Silently, Christian walked out of the room, leaving Beatrice to stay there alone.
Suddenly, Beatrice closed her eyes, and merely a fifth of a second later, a Dark Bolt appeared in front of her, and then a moment later, the bolt began rapidly flying throughout the room.
Even though Beatrice had to be somewhat vigilant so as to not by hit by any rocks, after all of her practice, controlling the Dark Bolt had become something trivial to her.
'4.1 points of Mana and 0.2 two seconds, unless I spend a lot of time, this seems to be the limit for using this control method' thought Beatrice before closing her eyes once again, suddenly, another dark bolt appeared in front of Beatrice in just under 0.2 seconds.
Compared to her previous bolts, this one had a major diference, the absence of a string to control it.
Merely a moment after that, the Dark Bolt flew towards the bed in the middle of the room, before flying in between the metal restraints on the bed, but as she controlled the bolt to pass in between two restraints, one for the arm and one for the chest, the bolt sadly clipped one of the bed.
Of course, If not for Beatrice's training these past few months, controlling the bolt using her mind with such precision would have been completely impossible.
As soon as that happened, the bed was suddenly destroyed, but as the metal restraints flew to all sides of the room, they suddenly stopped.
"That's good," mumbled Beatrice as sweat filled her forehead, as stopping the metal restraint's took a lot of effort on her part.
Suddenly, Beatrice felt a sharp pain on her thigh, causing her to look at the rock that had now fallen to the floor in annoyance, causing the rock to flow to a certain corner of the room.
After a while, Beatrice closed her eyes as she began measuring the current about of mana that she had missing.
"Just under 3.9 points of mana," mumbled Beatrice as a smile appeared on her face.
'Just 0.2 off,' thought Beatrice as the mana coefficient of the Dark Bolt suddenly appeared in her mind.
While the Dark Bolt using the string to control it had a mana coefficient of around 4, the coefficient of the stringless version was approximately 3.7, as both the mana used to create the string and to control the string added up over time.
This is the reason Beatrice concluded that she would no longer be able to improve her efficiency using the previous version, as she was approaching the maximum efficiency of the spell.
Of course, not all spells were so concrete, for example, the spell Beatrice had cast on Christian, the Rank 1 spell Dark Manipulation, and its Rank 0 counterpart Dark Hint, was much looser in the amount of mana needed, if the caster's spiritual energy was much higher than that of the target, the amount of mana spent could decrease or even increase.
Only her spiritual power which was much higher than normal, coupled with her ample preparation, including preparing a potion and learning about her target allowed Beatrice to cast this spell, otherwise, she would not have been able to do so at all.
Some other spells, like the Dark Shield, are even more stable than the Dark Bolt, requiring the same amount of mana for all mages, as in its essence, it is not complicated at all.
After thinking about some other things, Beatrice practiced the new version of the Dark Bolt spells four more times, until she fully emptied her mana, having to recover her mana a little bit to cast it the last time, as she barely didn't have enough.
Upon emptying her mana, Beatrice took a shower before sitting on her bed and opening a certain book before jumping past towards the eleventh page, and beginning to read about the new spell that was shown there.
'The Dark corruption spell is the last of the three quintessential spells that Dark Mages need to learn, having been created specifically to dispose of knights and other being who can not sense elemental energy'
As she saw the name of the spell and its purpose, Beatrice was somewhat disappointed, but as she read the method that the spell used to cause its effects her eyes brightened.
'Using elemental energy to cause harmful mutations, and since Knight cannot sense it nor control it, they are unable to resist it's effects, no matter how powerful they are,' thought Beatrice as her eyes suddenly brightened as she continued reading.
Suddenly, Beatrice regretted throwing that dead body from yesterday away, as it could serve as a precious experimental subject, now that she had spent all of her elemental stones, she was dirt poor.
Three days later,
"Can you give me that body? Since you are about to throw it away," said Beatrice as she looked at the older student that was holding a bag over his shoulder.
Without any words, the student took a look at Beatrice, and placed the bag on the floor before walking back to where he came from.
...
Looking at the dead body laying down on the bed, Beatrice took in a deep breath before beginning to cast the spell.
For a few moments, nothing happened, but after that, several weird growths suddenly appeared on the body, and merely a few moments after that the flesh of the dead body suddenly began morphing, causing a smile to appear on Beatrice's face.