Professor Flitwick continued, "Your observation is correct.
The Patronus Charm is the most direct example. It requires the caster to draw upon a deeply positive force within themselves. The quality of that force directly determines the Patronus's form and strength.
If there isn't enough corresponding light in your heart, the spell simply won't ignite."
Regulus listened quietly. The Patronus was familiar territory for him.
"In theory, any spell can be infused by the caster's inner state," Flitwick went on, deliberately borrowing Regulus's word.
"However, that infusion is usually unconscious and fluid, and very difficult to pin down.
Attempting to control it deliberately can be dangerous. Forcing your emotional state to conform to a spell may cause unexpected changes in the result.
It might turn out well. It might not. If it turns out badly enough, it can even cause damage on the level of the soul."
"But it isn't impossible," Regulus said.
Flitwick studied him for a long moment.
"No," the professor admitted at last with a slow nod. "It isn't impossible. The path is simply littered with pitfalls. Many witches and wizards have tried throughout history. Some succeeded. Some went mad. More became stuck halfway and could never again find the effortless purity they once had in casting."
Regulus inclined his head thoughtfully.
He understood that logic well. The Killing Curse demanded absolute murderous intent. The Cruciatus Curse required a genuine desire to inflict suffering. The Imperius Curse thrived on a powerful urge to dominate.
The stronger the emotion, the greater the spell's potency. That was one of the fundamental principles of dark magic.
"Many dark spells…" Flitwick lowered his voice, his expression growing grave.
In advanced circles, dark magic was not a forbidden topic. Very few young witches and wizards were entirely isolated from it.
"…require intense negative emotions like anger, hatred, fear, pain....
Those emotions reinforce dark magic, and dark magic, in turn, amplifies those emotions. The stronger the negativity, the stronger the spell. The stronger the spell, the deeper the negativity feeds."
His gaze swept across the classroom, steady and warning.
"For those who pursue power through dark magic, this becomes a dangerous cycle."
Flitwick paused and gave a faint shake of his head.
Once they discover a path to greater strength, they will look for ways to deepen their negative emotions, deliberately courting pain, magnifying hatred, immersing themselves in darkness until eventually there is not a trace of positive feeling left.
They grow more extreme. More detached from what most would call normal. At advanced levels, dark magic begins to erode the wizard in return. It is not that they cannot turn back. It is that they no longer recognize that they should."
Regulus knew the professor meant it as a warning about the dangers of dark magic.
Corruption.
Descent into darkness.
The loss of self.
But his mind had already moved elsewhere.
If one replaced the term dark magic with light magic, would the result truly be so different?
Were those consumed by extreme positivity any less dangerous?
What of a person who believed themselves absolutely right, whose sense of justice stood above all else, who viewed every opponent as evil by definition?
Was that so different from extreme negativity?
In both cases, the individual would sacrifice everything, including reason and empathy, for a chosen goal.
Wizards rarely feared being surrounded by the excessively righteous, because positive emotions were often associated with kindness, justice, and protection.
Yet extremity was still extremity. Society merely gilded one and condemned the other.
Regulus recalled a line from A Brief History of Soul Magic.
A handful of powerful, resolute dark wizards had used dark magic frequently without suffering its influence.
He suspected the explanation was simpler than most scholars imagined.
It was not that they resisted corruption. It was that they did not treat dark magic as something inherently corrupting in the first place.
Magic was magic.
A tool.
Any erosion came from instability within the caster's own heart.
If someone's mind was strong enough, if they knew exactly what they were doing, why they were doing it, and were willing to bear the consequences, did the classification of the spell truly matter?
Dumbledore had studied dark magic extensively in his youth and likely still did.
Grindelwald had been a master of it.
At their level, distinctions between dark and light felt almost superficial.
What shaped them was not the spell itself, but the purpose behind it, and the beliefs that guided that purpose.
As for Voldemort… better not to dwell on that.
Regulus pulled his thoughts back.
He was far from that level.
It was premature to think in those terms.
Still, he remained convinced that magic was a tool. Good and evil lay not in the spell, but in the choices of the one wielding it, and in the consequences that followed.
After class, Professor Flitwick asked him to stay behind.
"Your thinking is fascinating," Flitwick said, eyes gleaming behind his spectacles. "Continue to question and explore, but remember that theory and practice are not the same. The state of the mind is delicate. Forcing control may produce the opposite of what you intend."
"I understand, Professor," Regulus replied with a respectful nod.
The lesson had not introduced much that was new to him. Most of what Flitwick had explained, he already knew.
Still, he appreciated the warning. It came from genuine concern.
And it had served as a reminder.
Leaving the classroom, he headed straight for the Room of Requirement.
The training chamber was empty. The wooden floor gleamed softly beneath enchanted lamps. Regulus walked to the center of the room and sat cross-legged.
He began to consider the imagery of the starry sky.
What words truly captured it?
Calm, vastness, grandeur, eternity....
If he could inject that imagery as a stable backdrop into a spell…
He raised his wand toward a training dummy.
"Protego."
A silver-white shield unfolded before the dummy, a standard Shield Charm. Even thickness. Balanced magical distribution.
Regulus drew a slow breath and closed his eyes.
Star Guided Meditation turned within him. The four stars of Orion flared in the depths of his consciousness, but he did not focus on their precise configuration. He focused on the sensation.
Cold, distant starlight crossing unimaginable stretches of space to reach the earth. The steady burn of stars across incomprehensible spans of time.
The immensity of the universe. The eternity of the sky. The orderly motion of all things under immutable laws.
He let that awareness fill him.
Not an emotion but an image.
An understanding.
The universe was vast. Time was endless. He was insignificant within it, and yet that insignificant self could still think, still exist.
Then he cast again.
"Protego."
The shield bloomed once more.
This time, it was different.
The color turned silver-gray, with faint, star-like sparkles flickering across its surface.
The texture felt denser and more solid. Like stone compressed over billions of years by tectonic force, tight and unyielding.
The magical cost had increased by about fifteen percent.
He dispelled it and stepped forward, brushing his fingers through the space where the shield had stood.
Residual magic lingered in the air.
It worked.
The cost was higher. He had to enter a deeper meditative state to summon the imagery.
But it worked.
This was something beyond emotional resonance. It was cognitive resonance. A rational understanding of the universe and the starry sky used as the tonal foundation for spellcasting.
Regulus committed the result to memory.
It was only a beginning, but the direction was clear, and it was viable.
In the future, he could experiment further. Infuse an offensive spell with the imagery of falling stars. A binding spell with the concept of gravitational pull. Even a healing spell with the notion of life emerging within the cosmos.
There was much to test.
Magic truly was extraordinary.
No.
Magic had always been extraordinary.
---
In the final week of January.
Students still ran through corridors. Cutlery still clattered in the Great Hall. Professors still lectured in classrooms.
Yet something discordant had vanished, at least from Regulus's perspective.
Last term's unprovoked provocations, deliberate harassment, and probing confrontations had not occurred once this month.
Within Slytherin, the atmosphere was unusually calm. Older students nodded politely when they saw him. Younger ones stepped aside of their own accord. Even the most troublesome Pure-blood heirs seemed to have discovered manners overnight.
At least when facing him.
Regulus knew why.
His public appearance at the Malfoy family's Christmas banquet had signaled a certain stance. Many Pure-blood families would have instructed their children not to provoke him, at least for now.
But he also knew the peace would not last.
Among Pure-blood upbringing, one principle was deeply ingrained: status must be contested, relationships navigated through rivalry.
Peace was only a temporary ceasefire. Conflict was the norm.
Some might even believe that under Voldemort's banner, harmony was undesirable.
The Dark Lord might prefer his followers to compete and restrain one another. It made control easier.
Sooner or later, someone would step forward.
More likely to make a statement. To prove that their family did not fear the House of Black. That they dared to challenge.
Or perhaps someone more foolish would think that if the Dark Lord desired internal tension, then manufacturing conflict would count as loyalty.
Regulus waited.
He was in no hurry.
What was meant to come would come.