The name of this forbidden spell was Dimensional Siphon.
It could temporarily open a channel to the source dimension of magic and gather all the free magical energy in the universe into one body.
When activated, the user's eyes would turn into two miniature galaxies, and what floated around them would no longer be magic arrays, but countless miniature universes being born and annihilated.
However, that was the final stage of Dimensional Siphon, All Magic Returns to One.
To reach that stage, the user had to constantly use summoning magic to summon creatures from different dimensions, devour them, and accumulate their own source.
It seemed this Illuminati Doctor Strange was currently in the stage of accumulating his source. He had already begun devouring magical dragons from different universes, which was why he could transform into a three-headed magical dragon and summon magical dragons with ease.
If he truly completed Dimensional Siphon: All Magic Returns to One, then his strength would undergo a fundamental leap.
At that point, his strength would definitely reach the universal level, and in the All Magic Returns to One state, he might even temporarily reach the multiversal level.
A Doctor Strange at that level might even be able to charge into the Dark Dimension alone and beat Dormammu half to death.
Naturally, Harry was interested in such a powerful forbidden spell.
But to his disappointment, he could not cultivate this forbidden spell at all. In fact, he could not cultivate any forbidden spell.
Because the moment he began devouring magical energy from different dimensions, that magical energy would be forcibly devoured by the chaos magic inside him and become part of the source power of chaos.
Besides, he did not need to learn these forbidden spells.
He himself was already a forbidden existence.
The source power of chaos was a mighty force far beyond all matter and all living beings in the multiverse.
Although the three Ultron Titans were no match for Harry and Doctor Strange, they still held on with the powerful regeneration of their liquid metal bodies.
At this moment, the three Ultron Titans had already fused completely, forming a colossal Ultron Titan several thousand meters tall.
The fusion of the three Ultron Titans increased the Titan's strength several times over.
A charged attack from it could easily tear through a planet, and after being enhanced by reinforcement magic, its body was even stronger than the Hulk in a berserk state.
After the battle continued for nearly half an hour, Doctor Strange began to lose patience.
A dazzling magical glow suddenly bloomed across his body, and he turned to Harry.
"Master Potter, staying in this stalemate is not a good solution. Why don't we use our true strength and destroy this Ultron Titan?"
As soon as he finished speaking, he did not wait for Harry's reply. He began gathering the magic inside his body, preparing to cast a powerful forbidden spell.
The Sling Ring in Doctor Strange's palm spun out an arc of silver-blue light, and the dark purple magic condensing at his fingertips suddenly collapsed into a miniature black hole.
He thrust his palm forward, and that Void Mark shot toward the Ultron Titan, dragging a twisted tail of light behind it.
The thousand-meter-tall metal giant had only just raised its arm when the mark struck the center of its chest.
There was no earth-shattering explosion, only eerie annihilation.
The alloy armor on the Titan's chest was devoured as though by an invisible mouth, instantly turning into powder. The dark purple void kept collapsing inward, and wherever it passed, energy pipelines, magical runes, and even exposed mechanical bones were devoured in silence.
The enormous wound spread downward at a visible speed, crossing the rotating core gears and crushing through the metal spine that supported the body, until it left a huge cavity at the Titan's hip with spatial ripples flickering around its edges.
The Ultron Titan's upper body lost its support and collapsed in the Mirror Dimension.
The energy fluid remaining in its chest cavity had no time to gush out before the aftershock of the Void Mark shredded it into tiny motes of light.
The red light in its eye sockets flashed wildly as it tried to activate body-strengthening magic, but the runes that had just lit up vanished without a trace the moment they touched the edge of the void, like candle flames being pinched out.
When the final strand of magic dispersed, everything below the Titan's waist had been completely annihilated. Only half of its body remained, slowly spinning through the starry sky. Thin spatial cracks continued to seep from the metal edges of the break, as though the entire remnant might be torn apart at any moment by magic compressed until it had nearly become solid.
The power of this strike was far beyond what ordinary people could imagine, and this was one of the forbidden spells within Dimensional Siphon, Arcane Detonation: Void Mark.
By siphoning energy from a spatial dimension, it could create a Void Mark that devoured everything and continued expanding.
If this forbidden spell did not possess a spell structure designed to control and compress it, that constantly expanding dark purple Void Mark could expand endlessly.
With enough energy, it could even devour an entire universe.
Doctor Strange was somewhat dissatisfied with the damage caused by his forbidden spell.
"Unfortunately, with my current strength, I can only control a Void Mark of this level. If I force myself to use a stronger Void Mark, I will lose control of it."
"Damn it. The things Ultron creates really are difficult to handle. It can actually repair itself by drawing dimensional energy from other dimensions. Even after I heavily damage it, if we ignore it, it will return to peak condition within a few minutes."
"Master Potter, stop holding back. Destroy it completely."
Harry did not refuse, but he also did not act immediately. Instead, he accelerated his own time so that he would have enough time to think.
A few seconds passed in the outside world before he opened his eyes. The observational runes in his eyes flickered with a hazy magical glow.
Then he made a movement Doctor Strange found extremely familiar.
Harry straightened his wand, and countless Runic matrixes flashed at its tip.
At the center of those arrays, a dazzling green dot rapidly formed.
Under the infusion of a truly massive amount of magic, the magical glow containing the essence of disintegration rapidly compressed until it finally formed a Disintegration Mark similar to the Void Mark.
After the Disintegration Mark fully formed, Harry nodded in satisfaction and pushed it toward the fused three-in-one Ultron Titan ahead.
The Disintegration Mark flew extremely fast, even faster than Doctor Strange's Void Mark. It struck the Ultron Titan's chest in an instant, then began pulling everything around it inward.
Space, time, and the Ultron Titan's body were all dragged into the Disintegration Mark, then destroyed by its disintegration essence.
At that moment, time and space lost all meaning within the area being torn apart by the Disintegration Mark.
When that space appeared in front of Harry and Doctor Strange again, nothing remained there except a spatial cavity that kept collapsing and reforming.
This scene confirmed Doctor Strange's guess.
He quickly flew to Harry's side, stared at his eyes in disbelief, and asked in a trembling voice, "Wait. The magic you just released was a Void Mark?"
"No. That was not the arcane mark I know. It was an arcane mark you modified according to your own magic."
"Are you also studying the forbidden spell Dimensional Siphon?"
Harry shook his head in denial.
"I possess a special observational magic that allows me to imitate and analyze the fundamental essence of any magic I witness."
"After I analyzed your magic, I only needed to modify the energy portion of the magical runes into runes suitable for me. Then I could use a magical mark based on my own magical attribute."
Seeing Harry's casual expression, Doctor Strange felt completely numb.
Although Harry made it sound simple, how could the truth possibly be that simple?
The rune structure of any magic was strict, let alone a forbidden-level spell like a magical mark.
For this kind of magic, changing even one rune could cause the spell to fail, inflict severe mental backlash on the user, or even injure them through a magical explosion.
Yet Harry had modified the rune structure of a forbidden spell in a short time and had even used it successfully. It was simply unbelievable.
Was this the strength of a great mage renowned across the multiverse?
Doctor Strange had originally thought the gap between himself and Harry was not so large that it was unimaginable. But from the look of things now, the gap between them was still too great. He could not even see Harry's back.
After Harry finished speaking, Doctor Strange stood off to the side in dejection and no longer wanted to talk.
After dealing with the Ultron Titan, the two left the Mirror Dimension and returned to the real universe.
The war in the real universe was still continuing. Both sides had suffered many losses, but they were not fighting with all their strength. Instead, they were quietly waiting for the battle on the other side to end.
They all knew that the war they were fighting could not determine the final outcome.
What would truly decide the war was which side's Skyfather-level powerhouse won the final victory.
No matter what result came from the battlefield they were on, once the battle between Skyfather-level powerhouses reached its conclusion, that conclusion would become the final result of the entire war.
This was the terrifying dominance of Skyfather-level powerhouses in the universe. Before Asgard's God-King Odin passed away, no force dared offend Asgard.
But once God-King Odin died, Asgard became a piece of meat in the universe, and every faction wanted to take a bite.
At the same time, the reason the Mad Titan Thanos could run rampant across the universe, slaughtering half the population of civilization after civilization without anyone daring to stop him, was the same principle.
At that moment, a portal suddenly opened in deep space, and two figures appeared before everyone.
After those two figures appeared, the Asgardian soldiers cheered one after another. The dozen or so starships also began attacking with full force, trying to join the two newly arrived Skyfather-level powerhouses and wipe out the Kree starships ahead.
At the same time, the Kree starships fighting the Asgardian starships activated their energy shields without hesitation and began preparing their jump procedures, fleeing into the distance.
Because whether it was Asgard or the Kree legion, they all knew that after Harry and Doctor Strange emerged from the Mirror Dimension, the outcome of this war had already been decided.
Asgard would win.
And the only thing the Kree starships could do was flee with all their strength, hoping to escape with their lives from the hands of two Skyfather-level powerhouses.
Even though that slim chance of survival was so small it was almost nonexistent.
Sure enough, a magic array several kilometers in diameter suddenly appeared in the depths of space. Countless fluorescent green magical lights shot out from the array.
The Kree starships' energy shields, which were strong enough to withstand planet-destroying cannons, were torn apart by the disintegration beams like paper in just a few seconds.
Their high-strength alloy hulls were also rapidly disintegrated into their most basic atomic structures.
Without Doctor Strange needing to act, in only a few dozen seconds, the Kree starships were completely annihilated. All the Kree died there. No one escaped.
After winning this battle, all the Asgardian soldiers cheered, and under Thor's leadership, they began a celebration banquet.
Harry did not attend the banquet. Instead, he followed Doctor Strange to the universe where the Illuminati resided and cooperated with that universe's Iron Man and Mister Fantastic to research a machine capable of controlling magic.
He had to admit that those two were terrifyingly intelligent geniuses. They quickly found a possible direction.
However, even they could not completely control the magic inside Harry's body. They could only help Harry strengthen his own control ability. As for how much of his total magic he could control, that would depend on Harry himself.
But Harry had a feeling that if he had the machine they invented, he could control at least fifty percent of his total power.
And that amount of power was already enough.
After that, Harry did not return to his own universe. Instead, he stayed in the Illuminati universe.
Asgard's starships were still sailing through deep space and would need some time before they reached Hala.
Harry had once wanted to use a portal to bring Asgard's starships directly to Hala, but the Illuminati stopped him.
According to them, even if they immediately destroyed the Supreme Intelligence this time, they still would not be able to destroy this universe's Ultron.
To destroy Ultron, and even all Ultrons across the multiverse, Harry still needed to control his own magic. That was the true key to deciding the outcome of this battle.
Besides, the space around Hala had already been locked down by the Kree fleet using space-stabilization devices.
As long as he tried to open a portal near it, he would immediately be detected, then struck by concentrated fire.
So for now, the best option was to hold position and quietly wait for an opportunity.
During Harry's time in the Illuminati universe, aside from cooperating with Iron Man and Mister Fantastic, he did not stay idle.
He was communicating with Doctor Strange and trying to modify his Lending System.
As the number of Lenders increased, the amount of magic Harry could control was also rising rapidly through the Lenders' feedback. But as the number of Lenders grew, the Lending System began producing some problems.
His Lending System was simply too crude. In particular, the magic system was the crudest part of all. It could no longer keep up with the times.
The magic suitable for each person was different. Harry could not test each Lender one by one to see what type of magic suited them. Therefore, he needed to develop a magic system that could fit all Lenders.
Recently, he had gained some inspiration from a game.
Perhaps he could separate some magical runes and turn them into a plug-and-play magic creation system, allowing the Lenders to develop magic that belonged to them.
For example, take a spell that created a huge boulder. If tracking magic were added to it, then that boulder could automatically track an enemy and strike them.
With that, the power of the boulder spell would increase by far more than just several times.
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