Dol Guldur is located at the southern end of Mirkwood, originally a long-abandoned fortress.
But ever since the mysterious Necromancer occupied this place, a powerful dark force has enveloped the area, and dark creatures such as Orcs, specters, and giant spiders roam here.
It has become a demon's den, and no one dares to approach it.
On this day, Luke, Gandalf, Radagast, Elrond, and Glorfindel quietly arrived at Dol Guldur, avoiding the dense Orcs outside the fortress and sneaking into the interior of the fortress Castle.
All five of them had the Disillusionment Charm cast by Luke on them, so they did not encounter too much obstruction along the way.
However, the closer they got to the ancient Castle, the stronger the dark power became, making everyone's expressions more solemn.
"It seems we have been deceived all along," Elrond said, fully armored, drawing the elven sword from his waist, his expression wary and solemn, "The Dark Enemy has returned again."
The radiant Glorfindel also drew a magnificent long sword with wavy golden patterns covering its blade, instantly transforming from an elegant elven noble into a battle-ready warrior.
Luke, Gandalf, and Radagast also raised their respective wands and staffs, vigilantly scanning their surroundings for any danger that might appear.
The five entered the interior of the ancient Castle, looking around at the empty surroundings, not daring to relax in the slightest.
Gandalf was the first to act, heavily striking the ground with his staff and chanting a spell: "Evil hidden here, I command you to reveal yourself quickly!"
As the detecting magic halo spread around, the surrounding environment remained unchanged.
It was as if it was truly just an abandoned fortress Castle.
But none of the people present were foolish enough to be deceived by such an illusion; instead, they became even more vigilant.
After all, being able to hide from Gandalf's detection magic only meant that the enemy hidden in the dark was stronger.
Gandalf did not give up, continuing to use magic to detect, trying to force out the person hidden in the dark.
Suddenly,
The surroundings instantly became cold and dim, and a power filled with coldness and fear swept over, bringing a heavy sense of oppression that made breathing feel suffocating.
Nine armored specters appeared from the void; they were like ethereal shadows, with empty darkness inside their armor, holding morgul blades, and exuding a powerful dark aura.
They are the Nazgûl!
The Nazgûl were once nine of the most powerful human kings, whom Sauron, disguised as Annatar, Lord of Gifts, in the Second Age, gave nine Rings of Power infused with his dark power.
The Rings granted them near-immortal life, but they were gradually corrupted and fallen by the dark power within the Rings, eventually losing themselves and becoming servants of the Dark Lord Sauron, controlled by him.
The nine Nazgûl surrounded the group from all directions, and dark incantations like the language of the dead echoed in their ears, attempting to corrupt their minds.
"You should not have awakened!" Elrond said with authority, the elven sword in his hand releasing a powerful sharp edge.
Glorfindel radiated dazzling holy light; having bathed in the light of the Two Trees, the radiance around him contended with the surrounding darkness.
"Servants of Mordor, this is not your domain; you should return to the Unseen World!"
The Nazgûl were startled back by Glorfindel's radiance, but as if confident, they charged forward again, attacking the group.
Gandalf, Elrond, Radagast, and Glorfindel each dealt with two Nazgûl.
And the remaining Nazgûl, the Witch-king of Angmar, chose Luke as his target.
"We meet again, young Wizard; this time, you cannot escape." A sharp, low, spectral voice came from within the hollow, dark helmet.
Luke was facing a formidable enemy; without further ado, he waved his wand: "Bombarda!"
The dazzling spell passed through the Witch-king of Angmar's illusory body, as if it were merely an ethereal shadow.
The Witch-king of Angmar let out a low, triumphant laugh: "Wizard, your spells are useless against me."
With that, he raised his morgul blade and quickly slashed at Luke.
"Expecto Patronum!"
Sacred, bright, silvery-white mist gushed from the tip of the wand, condensing into a massive owl that spread its wings and extended its sharp talons, attacking the Witch-king of Angmar.
The owl Patronus was incredibly fast and agile, dodging the morgul blade and fiercely clawing at the Witch-king of Angmar's shoulder.
With a sharp, piercing shriek, a clear wound was torn into the Witch-king of Angmar's shoulder; the Patronus of white magic was naturally the bane of dark power, and the light-filled magic corroded the wound, causing him pain.
And the owl Patronus did not stop, continuing to attack the Witch-king of Angmar, leaving more wounds on his body.
Streaks of black mist dissipated from the wounds, continuously weakening the Witch-king of Angmar's power.
But as the chief of the Nazgûl, the Witch-king of Angmar was naturally not so easily dealt with.
Before the owl Patronus could leave too many more wounds on the Witch-king of Angmar, a morgul blade filled with evil cursed power pierced through the owl Patronus.
The owl Patronus let out a mournful cry and dissipated into silver mist.
The Witch-king of Angmar's hollow gaze fell directly on Luke.
"Wizard, I will pierce your heart with the morgul blade and transform you into my servant, a Nazgûl!"
With his Patronus extinguished, Luke's face was somewhat pale, but facing the aggressively attacking Witch-king of Angmar, he showed no fear or panic.
As he waved his wand, golden notes flew out, playing cheerful music.
This music, full of positive emotions, was inspiring and exhilarating fairy music for Luke's side.
But for the Nazgûl, it was uncomfortable noise that would disturb their thoughts and weaken their power.
For a moment, the tables turned, and Gandalf and the others quickly gained the upper hand, pressing the Nazgûl hard.
"Expecto Patronum!"
Luke cast the Patronus Charm once again.
An owl Patronus, far larger than before, almost comparable in size to a giant eagle, shot out from his wand.
The owl Patronus spread its massive wings, silver light streaming as it flapped, and it extended its sharp giant talons, striking away the morgul blade with one claw, then firmly grasping the Witch-king of Angmar and battling him in mid-air.
The giant owl Patronus and Luke were of one mind; it grabbed the Witch-king of Angmar and flew towards Luke, where a silvery-white spear with a gleaming, bright spearhead awaited the Witch-king of Angmar.
Luke held the divine spear Aeglos, and with the help of the Patronus, the divine spear directly pierced the Witch-king of Angmar's hollow, dark body.
The divine spear contained powerful destructive force, instantly tearing apart the Witch-king of Angmar's spirit form, causing him to vanish into thin air.
Having dealt with his opponent, Luke took a deep breath.
Seeing that the others were still fighting the Nazgûl, he quickly controlled his Patronus to attack the other Nazgûl, to lend a hand to his companions.
Soon, everyone dealt with the Nazgûl one by one.
However, feeling that the surrounding dark power had not diminished in the slightest, their expressions became even more wary and solemn.
Now that the servants had been dealt with, the next challenge would be to face their master behind them!
"Hogwarts Sign-in System: Dol Guldur detected. Do you wish to sign in?"
Before Sauron even appeared, the Sign-in System reacted first.
"Sign in!" Luke silently chanted.
"Sign-in successful. Congratulations on obtaining 'Advanced Dark Arts Revealed'!"
Looking at the Dark Arts book that appeared before him, Luke's mind was shaken.
He hadn't expected to get this item from a sign-in this time.
Although it wasn't the time to read, Luke still couldn't help but secretly flip through the contents of the book, dedicating a portion of his mind to it.
"Imperio, Crucio, Avada Kedavra, Fiendfyre Curse—and Horcrux creation!"
The more Luke read, the more his mind was shaken.
The rewards from this sign-in were too great! It almost covered the most powerful Dark Arts in the magic world.
If he could fully master these Dark Arts, his strength would undoubtedly undergo earth-shattering changes.
However, the most pressing matter was still the Avada Kedavra.
As one of the three Unforgivable Curses, Avada Kedavra causes instant death upon impact, and no magic can block it, making it the most dangerous and lethal Dark Arts in the magic world.
But it was also the easiest Dark Arts to learn.
It didn't require complex casting conditions; only the most extreme and intense emotions were needed. By channeling magic with malice and murderous intent, one could successfully cast Avada Kedavra.
The power of Avada Kedavra depended on the caster's malice and magic.
However, before Luke had more time to read, a terrifying dark power surged from all directions, like towering waves threatening to crush them.
Gandalf swiftly used his staff to erect a massive Holy Light barrier, protecting everyone.
Looking at the fluctuating Holy Light barrier, it seemed like a bubble in a raging sea, constantly on the verge of being breached.
"Gandalf, I'll help you!"
Radagast, for the first time, displayed the power of a Brown Wizard. His staff released another Holy Light barrier, reinforcing Gandalf's barrier and making it even sturdier.
Glorfindel radiated immense power and dazzling Holy Light, tearing a huge rift in the darkness, allowing a ray of sunlight to pour down from the dim sky, illuminating everyone and stopping the invasion of darkness.
Meanwhile, Elrond chanted ancient and mysterious Elvish, controlling the element of wind to form a hurricane that continuously swept through the entire Castle cave, determined to ferret out the hidden enemy within.
"He's hiding there!" Elrond's sharp gaze instantly fell on the highest, ruined tower.
The hurricane also swiftly rushed towards that tower.
"Confringo!" Luke cast the spell towards the tower without hesitation.
With a huge explosion, the tower was destroyed in the hurricane and explosion.
As the rubble fell, the enemy hidden within was exposed.
A massive red flame erupted from it, emitting a scorching and evil aura, coalescing into an impossibly huge fiery vertical eye.
"You cannot defeat me. Darkness rises again. Your faint light is isolated in the darkness, so small."
A voice filled with evil, temptation, and corruption echoed in everyone's ears.
The nine Nazgûl, whom they had previously dealt with, were resurrected from that fiery giant eye, surrounding the group from all directions.
Within the giant vertical eye was a dark void, and a very tall figure emerged from it, releasing a powerful and terrifying dark power, which crashed like an overwhelming tide against the Holy Light barrier sustained by Gandalf and Radagast.
The Holy Light barrier was on the verge of collapse.
The sky, moreover, plunged into complete darkness, as if all light had been swallowed.
Luke felt a terrifying sense of suffocating pressure, and it seemed as if countless evil voices were tempting him, attempting to corrupt his mind.
He quickly summoned his Patronus to his side, and only under the Patronus's power did he get a chance to breathe, like someone who had been suffocating for a long time finally emerging from water and gasping for air.
At the same time, he felt a warm energy from his chest pocket.
Luke's eyes lit up, and he quickly pulled a handkerchief from his pocket. Opening it, he saw five strands of golden hair emitting a silver glow.
It was the hair Galadriel had given him earlier.
He wove two strands of golden hair into a bracelet with his wand and then put it on his right hand.
Galadriel's hair contained the radiance of the Two Trees, instantly blocking the dark power's erosion of his mind, making him no longer affected. Luke watched as Gandalf, Radagast, Elrond, and Glorfindel successfully joined forces to resist Sauron's attack, and he breathed a sigh of relief.
It was fortunate that he had invited Elrond, Glorfindel, and Radagast, these three powerful helpers.
Otherwise, with just Gandalf and himself, they would probably have walked straight into a tiger's den.
"The age of Elves is over, the age of Orcs has arrived. You are fading, and I shall be the victor!"
The fiery giant eye erupted with even hotter flames, and from within the dark void of the vertical pupil, the tall figure stepped out.
Evil aura and terrifying dark power swirled around his body. He was clad in dark, grotesque armor, his figure tall and indistinct, shrouded in black mist and flames.
Seeing Sauron appear in his true form, everyone was greatly shocked and disbelieving.
Radagast exclaimed in horror, "He has a physical form! Has he truly been resurrected?"
"How is this possible? Unless he has regained the one ring, he cannot have a physical form." Elrond was also unwilling to believe it. Gandalf shook his head with a solemn expression: "Relax, Radagast, he is not truly resurrected with a physical form yet, otherwise we would have already fallen."
"Thráin II, the last owner of the seven Dwarf rings decades ago, was attacked and captured by Orcs and imprisoned in Dol Guldur. I think it was then that he obtained the seven Dwarf rings and gained a portion of his power through them."
Sauron's appearance greatly startled everyone, and the power he displayed also made them uneasy.
As Sauron approached through the air, that powerful dark force compelled the Holy Light barrier to shrink more and more.
With a powerful strike from Sauron, the Holy Light barrier was shattered, and Gandalf and Radagast were exhausted, unable to fight further.
"Sauron, servant of Morgoth, your opponent is I!"
Glorfindel unleashed a holy and powerful force, standing on equal footing with Sauron's dark power.
As the reborn Lord of the Golden Flower, he possessed pure magic comparable to a Maia, making him one of the strongest Elves in Middle-earth.
Now, facing the returned Sauron, he still did not fall behind.
"Glorfindel, the reborn Elf, I wonder if you will have a chance to be reborn again if I kill you this time?" Sauron's mocking voice echoed around, carrying a terrifying power.
With that, an even more terrifying power struck Glorfindel, forcing him back a few steps, and the light on his body dimmed somewhat.
Meanwhile, Elrond was entangled and besieged by the nine Nazgûl, unable to provide support for a moment.
"Luke, lend me your sword!"
Seeing Glorfindel at a disadvantage, Gandalf immediately shouted to Luke.
Without hesitation, Luke pulled out his sword from his spatial pouch and threw it over.
Gandalf deftly caught the sword, and its blade instantly ignited with a sun-like flame, so sacred, dazzling, and scorching!
"Evil spirits, stop! I am a servant of the Secret Fire, a wielder of the Flame of Arnor. Evil spirits, stop! The Dark Fire cannot defeat me, you evil Fire of Udûn! Go back to the void where you belong! No evil spirit can pass my resistance!"
Gandalf stood up again, and the sword, burning with the sun's fire, incinerated the surrounding Dark Arts.
The sacred flames forced Sauron to retreat, standing in equal opposition to the Dark Fire Sauron released.
"May the Valar manifest here and drive out the darkness!" Radagast also stood up again, releasing holy light to join the battle.
For a time, Glorfindel, Gandalf, and Radagast joined forces to fight the Demon King Sauron.
Both sides fell into a stalemate, and the aftermath of the battle caused the massive Castle fortress to continuously crumble and shatter.
Luke knew his strength was the weakest and did not go up to burden his comrades or cause trouble. Instead, he controlled his Patronus to attack the Nazgûl.
"Lord Elrond, I will hold back the Nazgûl, you go help Gandalf and the others!" Luke shouted loudly to Elrond.
Elrond knew that the tide of battle could turn in an instant. After shaking off the Nazgûl, he immediately joined the siege against Sauron.
Only Luke was left facing the nine menacing Nazgûl, and his pressure instantly increased.
The Nazgûl's power was not excessively strong; the only difficult thing to deal with was that they could not be killed, or rather, they possessed the ability to constantly revive.
Every time a Nazgûl was killed, it would quickly revive from the Eye of Mordor and continue to attack.
Fortunately, the white magic Patronus had a restraining effect on dark creatures like the Nazgûl. Luke did not get into a prolonged fight with the Nazgûl. Instead, he continuously had his Patronus harass and ambush the Nazgûl, preventing them from reinforcing their master.
The Nazgûl were not fools; they naturally saw Luke's intention and attacked Luke in unison.
As long as he was killed, the Patronus that restrained them would naturally disappear.
Five Nazgûl held back Luke's owl Patronus, while the other four Nazgûl fiercely charged at Luke.
Luke did not panic at this; he tightly gripped his divine spear, aeglos, in a stance ready for battle.
But the next second, just as the Nazgûl were about to reach Luke, four sharp points shot out from Luke's pocket, instantly flying towards the four Nazgûl.
The sharp points were too fast and caught the Nazgûl by surprise, giving them no time to react. The sharp points pierced through the Nazgûl's spirit bodies.
After they reacted, the Nazgûl finally saw that they were four daggers.
"No!" The Nazgûl let out painful screams; their spirit bodies were severely damaged, and the Dark Arts on them were dispelled by the daggers.
The Nazgûl's bodies rapidly twisted, collapsed, and imploded, then exploded, creating a huge shockwave that instantly destroyed the surrounding buildings.
These were the four daggers Luke had obtained from the Barrow-downs, originally forged by the Northern Dúnedain. They were weapons specifically crafted to combat evil forces, inscribed with runes that could bring disaster to Mordor.
Now used on the Nazgûl, they finally displayed their intended effect.
The Nazgûl struck by the daggers had their evil power dispelled and could not be revived by Sauron's Eye of Mordor for a short period.
Luke's pressure instantly lessened.
And the remaining five Nazgûl, looking at the four daggers hovering around Luke, were also very wary and fearful, not daring to approach. Having lost four subordinates, Sauron, as their master, naturally sensed it.
The giant Eye of Mordor turned towards Luke, emitting evil, dark mental power.
"Young Wizard, I know you; you killed my once-trusted Orc servants—
"I see your hidden desire, your longing for great power. I can grant you great power, teach you to forge Rings of Power, make you immortal, and even dominate this world, if only you submit to me—"
The seductive, corrupting, and fallen demonic voice echoed in Luke's ears, attempting to invade Luke's mind and twist his soul.
Luke's expression was one of struggle; the hair braided around his wrist emitted light, protecting his mind and firmly fighting against Sauron's mental erosion.
But even so, his mind was inevitably affected, producing many crazy, negative emotions, with only a final shred of calm and reason remaining in his heart.
He looked up and saw a smug and mocking expression flash in the Eye of Mordor, as if it had already foreseen the scene of him falling, being corrupted, and then controlled.
An endless surge of unwillingness and anger rose in Luke's heart, and a crazy idea formed in his consciousness as his defenses gradually retreated.
Now his mind was filled with negative emotions due to the influence of Sauron's evil power.
So why didn't he use these emotions to turn the tables?
In an instant, the contents of "Secrets of the Dark Arts" he had read before flashed through his mind, becoming clearer than ever.
He raised his wand, aimed it at the Eye of Mordor, immersed himself in negative emotions, transforming them into endless malice, retaining only a final shred of clarity, and then shouted as if venting:
"Avada Kedavra!"
In an instant, a dazzling green light, emanating an aura of extreme darkness, destruction, and devastation, illuminated the clouds above, striking the Eye of Mordor with ill omens and curses.
Sauron, who was fighting Gandalf, Elrond, and the others, instantly froze. The surrounding Dark Arts, without a controlling will, became chaotic and disordered.
Accompanied by an incredibly piercing scream of pain, Sauron seemed to suffer a heavy blow, and his struggling armor became twisted.
Elrond seized the opportunity, unleashed powerful strength, and thrust his sword into Sauron's hollow, dark helmet.
Sauron's towering form could no longer be maintained, directly disintegrating into black mist and flames, instantly escaping into the Eye of Mordor.
The giant fiery Eye of Mordor suddenly dimmed, and the surrounding Dark Arts also weakened by several points.
Seizing the opportunity, Gandalf, Radagast, Elrond, and Glorfindel increased the intensity of their attacks, forcing the Eye of Mordor to continuously retreat and even shrink.
But even so, the Eye of Mordor's tone remained arrogant.
"You cannot defeat me, nor can you stop me—darkness will return!"
The Eye of Mordor erupted with terrifying demonic flames, unleashing its strongest attack, forcing back the four besiegers.
The five Nazgûl were instantly absorbed into the Eye of Mordor, merging with it.
"Three Rings for the Elven-kings under the sky—
"Seven for the Dwarf-lords in their halls of stone—
"Nine for Mortal Men doomed to die—"
The ancient Dark Speech echoed around, seeming to narrate, yet also like chanting a spell.
Within the Eye of Mordor, nine Rings of Men and three Rings of Dwarves appeared faintly.
"One Ring to rule them all, One Ring to find them, One Ring to bring them all and in the darkness bind them———The One Ring shall be mine!"
"Light shall surely banish darkness, and Middle-earth will usher in a new era, but there is no place for you there."
A voice came from behind everyone.
Following it was a sacred radiance that forced back the Dark power.
"Lady Galadriel!"
Everyone showed expressions of pleasant surprise.
Galadriel, clad in white, walked slowly, radiating a moonlight-like glow that made the surrounding Dark powers recoil as if burned.
The Eye, seeing Galadriel, its pupil constricted, and its hollow, cold voice became deeper.
"You always appear at the wrong time."
"No, you awakened in the wrong place," Galadriel stepped onto the scorched earth, ignoring the scorching of the demonic flames, and approached Sauron's Eye.
"Sauron, servant of the Dark Morgoth, here you have no power, you have nothing to rely on, no name, no face, no form. Return to the void to which you belong!"
Galadriel raised a crystal phial that seemed to contain stars, and from it, an incomparably dazzling starlight was released.
That was the crystal phial containing eärendil's light, which held powerful holy power and had a natural restraining effect on evil creatures and Dark power.
eärendil's light is the light of Eärendil's Star, the brightest morning star in Middle-earth.
Eärendil is Elrond's father; he wears the Silmaril crafted by Fëanor on his head and sails the skies in his white ship. The light of the Silmaril on his head became the "Star of Hope" for Middle-earth.
The Silmarils are sacred artifacts crafted by Fëanor, capturing the radiance of the two trees. They are treasures that even Sauron's former master, the Dark Morgoth, coveted, leading to the War between the Elves and Morgoth in the First Age.
The crystal phial in Galadriel's hand stored precisely the light of the Silmaril, which was also the radiance of the two trees.
Under Galadriel's full power, eärendil's light in the crystal phial unleashed its most potent holy power.
Sauron's Eye, illuminated by eärendil's light, was rapidly corroded as if by sulfuric acid, letting out a series of painful screams.
Cracks appeared in the Eye amidst the flowing light, and a shriek tore through the sky: "You will eventually fall into darkness!"
As the smoke and dust cleared, the Eye shattered, with only a dark red star-like ember shooting rapidly eastward, leaving a trail of sulfurous fire in the clouds.
Sauron was defeated once again, losing his power and fleeing like a wolf.
Galadriel, who had unleashed eärendil's light, also retreated, exhausted, and was promptly supported by Elrond and Gandalf, collapsing pale-faced into Gandalf's arms.
The crystal phial in her hand also dimmed.
"Lady Galadriel, are you alright?" Gandalf asked with concern.
Everyone gathered around, looking at Galadriel with concern.
Galadriel shook her head, her gaze fixed on the Far East, filled with worry: "Although he has been temporarily expelled, Sauron's spirit still lingers.
He could return at any moment!"
"This is already a very good outcome, my Lady," Glorfindel comforted, "Sauron suffered heavy losses this time; his form has been destroyed, and his power lost again. Only a wisp of his soul remains wandering, making it difficult for him to recover in a short time."
"Moreover, as long as the one ring exists in this world, Sauron can never be destroyed."
Elrond's expression was serious: "Sauron fled to the Far East, likely to hide back in his old lair, Mordor. We need to warn Gondor to be vigilant in the Mordor region."
Gandalf's gaze fell on the Orcs gathered outside Dol Guldur Castle, who scattered into the dense forest as Sauron fled.
"When those Orcs fled, they were dispersed yet orderly, retreating towards the northeast, clearly controlled by someone behind the scenes."
His gaze met Luke's, revealing a worried expression.
'I fear that after Azog's death, a new leader quickly emerged among the Orcs, which is not good news for us!'
Luke, however, didn't seem too concerned about these matters. He looked at Galadriel, whose face was still pale, and pulled out a Potion from his spatial pouch.
"Lady Galadriel, this is a soothing Potion I made; perhaps it can help you."
Galadriel did not refuse Luke's kindness and gave him a smile.
Luke almost got lost in that smile and quickly averted his gaze, silently reminding himself that she had a husband.
Seeing his embarrassed look, Galadriel smiled even more brightly.
She curiously examined the red Potion Luke gave her, then drank the entire Potion at once. The bitter taste made her frown slightly.
But the Potion's effect was also very obvious; a blush quickly appeared on her pale face, and she no longer looked weak and powerless.
"Thank you for your Potion, Luke, I feel much better!" A hint of surprise flashed in Galadriel's eyes; she hadn't expected Luke's Potion to be so effective.
And Luke was even more surprised; ordinary people only needed three drops of the soothing agent to recover.
But Galadriel had directly consumed an entire bottle's worth and only recovered somewhat.
Such a disparity made Luke secretly click his tongue in wonder.
Seeing Galadriel recover significantly, the others looked at Luke with even more surprise.
Elrond's gaze towards Luke became even more benevolent.
"The victory in today's battle against Sauron will surely be recorded in epics. Wizard Luke has made great contributions! If not for your powerful spell that severely wounded Sauron, causing his form to collapse, we would not have gained the upper hand and finally waited for Lady Galadriel to successfully banish Sauron."
The others expressed their agreement with Elrond's words, acknowledging Luke's contribution to this battle.
They even completely placed him on the same level as themselves.
But Gandalf still said with some concern: "Luke, although I may be overly worried, I hope you do not allow yourself to become addicted to the Dark Arts. Pursuing power is not wrong, but do not let yourself fall into darkness and become a slave to power."
Although the others did not speak, their eyes conveyed the same meaning.
The Avada Kedavra spell that Luke cast was filled with a strong Dark Arts aura, naturally, it could not escape the eyes of these powerful individuals. Luke was somewhat surprised and unexpected to hear this. He had originally thought that these upright figures would disapprove of his use of the Dark Arts, or even strongly oppose it.
He hadn't expected them to merely warn him not to become addicted to the Dark Arts.
"Thank you for your reminder, Gandalf, I will pay attention!" Luke nodded seriously.
He naturally knew that the Dark Arts were very dangerous, and excessive indulgence could change one's character and even distort one's soul.
The essence of the Dark Arts is to harm, control, or deprive life, and its power is closely linked to negative emotions (such as hatred, greed, cruelty, etc.). Prolonged exposure to such extreme emotions can gradually twist one's mind.
Moreover, the abuse of the Dark Arts can also cause visible damage to the user's body, making their appearance unrecognizable.
Just like those Death Eaters in the Harry Potter world, each of them had a gloomy, twisted appearance and a mad, cruel personality. Some, like Lord Voldemort, didn't even look human anymore.
The few people present were all knowledgeable and profoundly wise individuals, naturally able to see that Luke was not just giving a perfunctory agreement.
Thus, their gazes towards Luke became even more appreciative and friendly.
Throughout the long years, they had seen countless talented individuals go astray on the path of seeking power.
They did not wish for the person fighting alongside them today to one day fall into darkness or even stand on the opposing side.