Harry Potter and the Great Old Ones

Chapter 87 The Flame of the Spirit
Tiera is currently lying in bed, using her left hand to control a worm and chat with Tom Riddle, while her right hand is on "Ancient Black Magic Ritual Studies" studying Fiendfire.

Although the three Unforgivable Curses are called Unforgivable Curses, their actual power is not very strong.

The Killing Curse is so named because there is no counter-curse; touching it results in instant death.

The Heart-Drilling and Bone-Digging Curse is because the caster must harbor extreme malice in their heart, which, from a legal perspective, constitutes the crime of intentional injury.

Although the Soul-Stealing Curse is a bit less impressive than the previous two, it is still disgusting enough.

I did something bad—ah, I was under the control of the Imperius Curse.

I want to do something bad—ah, I'm going to use the Imperius Curse to control someone.

The initial elements that constitute an artificial life form determine its subsequent properties and three-dimensional forces.

The three Unforgivable Curses are indeed profound dark magic, but they cannot be considered powerful dark magic.

In terms of sheer power, it is far inferior to the Fiery Blaze.

According to Merlin's notes.

The Fiery Flame can also be called the Spiritual Flame.

Just like a flame needs three conditions to burn: a combustible material, an oxidizer, and an ignition temperature.

The ignition point of the Fiery Blaze is a spell.

Oxidizing agents are the continuous output of the will to destroy in the spiritual dimension.

The combustible material for Fiendfire is a wizard's dark magic power.

In other words, Fiendfire itself is a flame that burns the spiritual dimension.

Since the magic of wizards originates from the spiritual dimension.

Ordinary non-dark magic spells are merely fuel for Fiendfire.

That's why it's so unstoppable, even able to ignite Horcruxes.

After all, a Horcrux is essentially an external black magic battery.

If a battery gets on fire, it will explode.

Of course, Fiery Blaze is not invincible; it also has its nemesis—

Mental spells.

To be more specific—

For example, the spell can stop immediately or all spells can end.

The principle behind these two types of magic is quite simple: the output of the spiritual presence powerfully blocks or alters the magical configuration of the spell, causing the spell to become disordered from within and eventually dissipate.

These two spells are also the only two known spells that can stop Fiendfire.

Of course, you can also use your own fiery flames to devour the enemy's fiery flames and then let them dissipate.

But usually, someone with that ability would just burn the opponent to death with raging fire; there's no need for such a complicated method.

Besides Fiendfire, Tiera also saw another spell in the Nameless Priestly Book called "Spirit Fire".

Similar to the working principle of Fiery Blaze, Spiritual Fire uses spiritual existence, that is, the soul, as fuel, incantations as the ignition point, and spiritual existence as the accelerant for combustion.

The soul, as fuel, has two sources—one from others and one from oneself.

The Spiritual Fire differs from the Fiery Blaze because it is a flame entirely dependent on the soul. The caster's control over the spiritual dimension, which serves as the raw material, directly determines the caster's control over the Spiritual Fire.

Using another person's spiritual existence to ignite a spiritual fire, even if various curses and black magic methods can control the other person's spiritual dimension, the spiritual existence used as raw material will most likely still lose control due to the immense pain generated when the spiritual fire burns.

Although this spiritual fire is powerful, it is not very effective in actual combat.

Unless it's a desperate gamble, burning one's own soul to perish together with the opponent.

However, there is always a way to overcome difficulties. Tiera read about a method for cleverly utilizing spiritual fire in another relatively safe dark magic book in the library, the "Red Priest's Handbook," which was called "Martyr."

Summoning a demon using a dark ritual, using one's own body as a vessel for the demon to possess, and forging a powerful binding pact with the demon—

To make a wish to a demon, requesting enhanced magical abilities, comes at the cost of one's body, soul, and magic becoming entirely the demon's possession ten years later. Demons... or rather, devils, are a very unique type of two-dimensional creature.

Just as Muggles only have a mental dimension and a material dimension, demons only have a spiritual dimension and a mental dimension.

Like Dementors, they lack a material dimension, so they can only be sensed by Muggles, not seen.

However, unlike demons, Dementors and wizards/Muggles can be observed in the material world because their mental dimensions highly overlap.

Demons, due to their vastly different spiritual dimension from Muggles and wizards, can only exist in a spiritual world called Hell.

If a demon wishes to enter the prime material world, it can only choose to possess another being.

This means establishing a mental connection with a wizard or Muggle, thereby taking over their physical body in the material world.

However, due to the inherent heterogeneity of demons, the bodies they occupy in this way will soon collapse, forcing the demons to return to hell.

Alternatively, a demon could trick a wizard into binding its own spiritual and mental existence to the wizard's through a contract, gradually merging them as the contract is completed.

In this way, the demon could possess the wizard's body, gain material dimension, and complete the evolution from two-dimensional to three-dimensional life.

The demon's spiritual and intellectual existence is undoubtedly far stronger than that of the wizard, but in the initial stages of fusion, in order to better adapt to the material dimension, this fusion must be guided by the wizard's will.

This left a loophole for the wizards.

In the early stages of the fusion, while the wizard could still suppress the demon's consciousness, a series of complex calculations and precise operations were used to ignite the spiritual fire with the demon's part of its spiritual existence.

Using the immense energy generated by the spiritual fire, one can merge one's own spiritual dimension with the spiritual dimension of the demon.

If all goes well, the wizard will eventually merge with about 50% to 70% of the original spiritual essence of the demon.

Even if the demon chosen is just an ordinary low-level demon, it will still grant it twice the magical power of an ordinary adult wizard.

If demons weren't confined to a spiritual world called Hell, and if their spiritual dimension weren't vastly different from that of wizards and Muggles, the wizards and Muggles of this world would likely be enslaved by demons just like house-elves.

The advantage of this "martyr" ritual compared to "black magic evolution" is that there is no limit to the number of times the "martyr" can be used.

Just as the first step in alchemy is to use powerful flames, magic, or chemical reactions to remove impurities and obtain pure three-dimensional matter.

The powerful energy of the Spiritual Fire can remove most of the impurities from the spiritual dimensions of both wizards and demons, allowing them to combine in a purer form.

This eliminates the problem of being unable to interact with a second person due to the conflict of dark magic forces in the "evolution of dark magic".

Of course, the shortcomings of "martyrs" are also obvious.

That means the success rate is too low.

Most demons aren't stupid; how could they possibly leave no loopholes in their contracts?

Moreover, controlling a demon is far more difficult than torturing a wizard.

Unless one possesses an extremely meticulous plan and exceptional intellect, it is impossible to trick a demon into signing a pact with a wizard without leaving any room for doubt.

Therefore, using "martyrs" to quickly increase strength was not even within Tiera's consideration.

However, if Tiera wants to return home, she must become an immortal being in order to pass through the endless barriers of space and time and cross the Gate of a Thousand Gates.

The only known path to Tiera is alchemy.

However, simply brewing an elixir of immortality with the magic stone can at most allow one to "live," but it cannot make one immortal.

Unless one uses alchemical methods, like crafting a Philosopher's Stone, to gradually remove the impurities from one's spiritual, mental, and material dimensions, transforming oneself into a pure being—

However, if Tiera were to actually do that, she would probably turn into an indescribable aggregate of light.

After all, his memories, values, and thought processes are inherently "impurities."

Of course, he could also draw upon powers beyond the three dimensions... such as praying to an outer god to conceptually transform his memories, values, and thoughts into a pure form—

Then he's just being nosy.

Regarding the question about demons, in the Harry Potter movies, I forget if it was the first or the second one, there's a scene where Hermione is in the library, and there's a book on the bookshelf behind her called "Fifteenth-Century Demonology".

Therefore, I believe that demons exist in the world of Harry Potter.

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(End of this chapter)