Time Magic has many taboos during its use.
If these taboos are violated, some rather terrifying things can happen.
Meeting your past self is one of them.
The reasons for this are varied, not only involving how future information might affect the past, but also the chaotic currents of time that could lead to the time traveler being 'erased' by time itself.
For instance, if you were supposed to stay home today, but your present self told your past self the lottery numbers, and your past self went downstairs to buy a ticket, only to get hit by a car.
Because the past was altered, your present self would simply die.
There are also other reasons.
Undeniably, some people are very sensitive about the issue of their own 'uniqueness.' If two 'selves' were to appear, it's possible they might even fight each other.
Every taboo of Time Magic was discovered through the blood of the Department of Mysteries and other past Seers who researched time.
But there are always those who, relying on their skill and boldness, disregard these taboos.
Voldemort, for example, and Roger.
Voldemort's reason is that the danger doesn't befall him; all temporal risks are borne by the Horcruxes.
He only needs to use a Time-Turner to have his past selves from different timelines devour each other, nurturing the strongest Horcrux, and finally have the strongest one merge with his current 'weak' self.
Roger's confidence comes from a different source.
Through the prophecy of his crisis intuition, Roger had witnessed Voldemort's methods. By repeatedly observing Voldemort's spellcasting and the structure of the Time-Turner, combined with his own mastery of Time Magic and Alchemy, Roger created his own Time-Turner.
Roger returned to the past, an hour or two prior, and spoke with himself face-to-face.
Thanks to his crisis intuition, Roger and his past self could achieve absolute mutual trust.
This is because if either party harbored any ill will, it would be immediately detected.
Roger would also sense it if the information shared could significantly impact the present.
This trust and safety allowed Roger to conduct some experiments.
"I call it the 'Time Plague'," Roger said with a smile.
This world has no magic that can travel to the future.
But being able to travel to the past is already enough.
"Look," Roger said, extending a fingertip into his collar and pulling out a pendant that shone with a dark golden light, seemingly operating yet seemingly doing nothing.
The moment the pendant appeared, Harry's vague, innate perception felt as if it had been pricked by a needle, causing pain even more intense than when the lightning scar on his forehead burned! "After continuously communicating with our past selves, 'we' have come up with an idea."
"Using our minds, we will connect the past and the present into a single network."
"Not a fusion, but a parallel connection of one node to another. Each 'self' is interconnected while also remaining independent. I can feel the subtle differences between myself and 'us' through these links."
"It's still in the experimental stage."
"And once it succeeds," Roger paused.
"Every past node will become my 'mental anchor'."
It's not like Voldemort's Horcruxes, which are backups of the self, but more like a coordinate, a compass, ensuring Roger never completely loses himself, no matter when. As long as he wishes, he can always look back at the path he's taken and feel every subtle change within himself.
This developmental direction actually has many different branches. If developed horizontally, it would be like forming something akin to a collective subconscious sea, Alaya-vijnana, with oneself and becoming an entity that spans across time and space.
At that point, Roger would no longer fear timeline disruptions, because the past would be the present. Even at his weakest, it would be equivalent to his strongest. Roger would not only anchor his own mind but all of his time! And vertically...
"Of course, my current technology is far from mature. To advance further in the future, I will need many people to help me perfect it." As he spoke, Roger patted Harry's shoulder, the meaning self-evident.
The Time Plague is Roger's concept. If he could surpass the Hour-Reversal Charm, surpass the backlash of time, and travel back to the time before he left school, or even further, continuously tracing back through the past.
Until he crossed over into 1990, the year he arrived in this world, and went even further back.
At that point, Roger would be like a temporal anchor, firmly embedding himself into the history of this world, spreading like a plague from the present into the more distant past.
Feudal era, Stone Age, Cenozoic, Cretaceous, Jurassic, Ordovician, Cambrian... all the way back to the Big Bang, the moment the world was born! From ancient times to the present, omnipresent.
That would be the true, temporal plague!
Currently, those are very distant matters. Roger estimated that he might not even possess that level of power by the time he could defeat the entire world single-handedly. One must take things step by step; haste makes waste.
Right now, the Time Plague's greatest function for him is as a mental anchor.
Once the first stage of the mental anchor is complete, Roger can begin the second stage of his Path of Immortality.
The second and even third stages are the most dangerous periods for Roger!
"...This is too crazy." Unlike a complete layman who doesn't understand Time Magic, Harry, under Roger's hands-on guidance, has become one of the few qualified explorers of temporal power in the world today.
He understood how terrifying what Roger was doing was. If it weren't for Roger being a powerful Seer, an ordinary person doing this would have died countless times from temporal backlash.
Just as Harry frowned, preparing to discuss further with Roger, a voice sounded from behind Harry.
"Hey! Why are you taking so long? If you don't come back to eat soon, I'm going to clear the table..."
The stout Vernon, with heavy footsteps and an impatient expression, stopped mid-sentence as he saw Roger standing at his doorstep.
The words died in his mouth.
Vernon didn't have Hermione's extraordinary memory, but he wasn't so forgetful as to not remember someone he'd seen just a few days ago.
Especially for someone like Roger, who was put on a pedestal by so many people.
Vernon disliked those spooky wizards and didn't want to say anything polite to Roger.
"I..." But as the words reached Vernon's lips, he found he couldn't speak them.
It wasn't that Roger had done anything, but rather that Vernon himself was resisting.
It was like a mouse instinctively cowering before a cat, or humans involuntarily stiffening when faced with fierce beasts or snakes.
And what Vernon faced was even more severe.
It was the instinctive suppression between life forms of different levels.
Muggles, wizards, self-material reorganization, temporal dimension differences.
There was a vast chasm of three life-level differences between Vernon and Roger. This gap was so immense that even without Roger revealing anything, Vernon felt fear under the influence of the collective unconscious.
"Hmm?" Roger noticed Vernon's abnormality.
After a moment's thought, Roger understood the cause and effect.
Although Muggles couldn't use magic, their thoughts could still stir magic. The fact that large numbers of Muggles' negative emotions could nurture dark magic creatures was proof that they were part of a massive ritual encompassing the entire world.
When a "celestial body" with immense "gravity" appeared, it would not only cause things as massive as Harry to react, but also affect tiny things in a magical sense, like Vernon.
Since the cause was known, it was naturally simple to prescribe the right remedy.
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