Sand Devil Slayer Magic

Sand Demon Slayer Magic (砂の滅鬼魔法, Suna no Mekki Mahō) is a form of Caster Magic, Lost Magic and lastly, form of Demon Slayer Magic, which allows the user to harness and manipulate the power of sand.

Overview
Sand Demon Slayer Magic is a sub-type of very rare Demon Slayer Magic, which can be utilized only by Demon Slayers (, Dēmon Sureiyāzu lit. Demon Power Users). This Magic allows its user or users to transform their physical bodies into a Demon's, more correctly, Demon Slayers are able to change their physical body to match the corporeal body possessed by Etherious, which also grants them various characteristics, that are typical for their demonic mentor.

In order to learn Sand Demon Slayer Magic, the Etherious who passes on the magic to their student, modifies their Magic Origin with their own Magical Barrier Particles (魔障粒子, Mashōryūshi, lit. "Negative Energy Particles"), which changes how the magical energies circulate within their body, therefore causing the Etherious' main ability, the Curse (呪法, Jūhō), to enter the student's body momentarily; as a portion of their own power changes the student's magic into that of Demon Slayer. Continuing with this process, the Magical Barrier Particles of the student acts alongside the magic energy of the body in order to catalyze a variety of bodily processes when younger, therefore allowing the morphing of their physiology to a point where the individual has adopted some physical traits, as well as the element from the said Etherious.

Sand Demon Slayer Magic allows its users to produce and control sand element from any part of their body, which can be used in melee combat or for other purposes. Sand incorporated in this type of Magic is quite different from a standard Sand Magic and sand elements, because of its nature; Sand Demon Slayers can make their body a makeshift weapon unique to themselves and themselves only to the point, that they are able to even turn into their element itself, the form which is renown as the true essence of a demon's existence.

Changed Physiology
As it was said earlier, Sand Demon Slayers like other Demon Slayers, have changed physiology, which is suiting the demonic mentor's one. First of all, it must be said, that they become totally invulnerable to the sand element. Sand Demon Slayer Magic user is naturally immune to the effects of their own element, that came from both their own person and to those from other sources, and can also consume external sources of their natural element to replenish their own strength and energy. However, Sand Demon Slayers cannot consume the sand, that they produce themselves, and elements must be consumed through the mouth.

Interestingly, the use of Demon Slayer Magic, is corrupting a mage's souls to a sufficient enough degree for a demon to take possession of their body. Plus the contract that is signed when a mage starts learning this magic is another link that allows the Etherious, who is mentoring them, to take over their body. The more this magic is used, the easier it starts to become for the Etherious to take over. Also the repeated sharing of thoughts and emotions with an Etherious, which happens every time the Etherious tries to take over the mage's body, starts to drive the mage insane, a human's mind just not being capable of processing most of what goes on in a Etherious' head.

Element Traits
It was said earlier, that sands, which are incorporated in this Magic differ from standard sand element. The generated sands can be manipulated in a wide variety of ways, which allows, for example, create quite solid structures with it, like different weapons, armory, etc. In addition to it, Sand Demon Slayers can attain a little control over the earth element to, as sand can be consideres as the earth in a particle's form, however, Sand Demon Slayers can only shatter the earth and rocks in order to fully manipulate them, but cannot use it just like Earth Demon Slayers or even usual Earth Mages. Also, this Magic can be enhanced by Wind element, which can be attained by both natural means and support from Wind Magic.

Demon Force
Demon Force (デーモン・フォース, Dēmon Fōsu) is the final stage of the Demon Slayer Magic, though the exact conditions to invoke it vary from person to person. When Demon Force is achieved, the user's body completely turns into their element through saturating the insides of their body and the outsides with an overdose of Magical Barrier Particles, and their strength, speed, and demonic abilities are enhanced, improving their combat capability significantly. Demon Force greatly increases the damage done by standard Demon Slayer Magic attacks, and grants the user access to more advanced, powerful attacks. It also drastically enhances the user's physical prowess, making them far stronger, more resistant and faster, and boosts their demonic power, prompting it to violently become visible, taking on the shape of a demonic visage; when used at the fullest, the generated silhouette seems to gain corporeality, likely as a result of the immense amount of demonic power employed. As the Demon Slayer Magic user's entire body turns into their element, after activating Demon Force they are virtually immune to physical harm. They can allow any attack to simply pass through them or simply absorb the attack; it is essentially a boost in the demonic properties that Demon Slayer Magic provides to the user.

Cursed Power
Cursed Power: More coming soon...

Dual Element Demon Mode
Shoichi is also known for his achievement, which can be considered as both the phenomenon of Dual Element Slayer Magic and a miracle in case of Demon Slayers. He is able to utilize Dual Element Demon Mode (モード二要素鬼, Mōdo Niyōsoki), which allows him to harness the power of not only the sand, but the secondary element, which he was able to consume under the self-nullyfying of his Magic Power, which granted him enough room to consume and even utilize the secondary element; also such process was quite hard damaging.
 * Iron Sand Demon Mode (モード鉄砂鬼, Mōdo Tessaoni): Iron Sand Demon Mode is a special application of Sand Demon Slayer Magic, it is the Dual Element Demon Mode, which allows the user to maintain both the power of their usual Sand Demon Slayer Magic and consumed Iron Demon Slayer Magic. Shoichi is able to call upon the Iron Sand Demon Mode, when he combines his sand with iron element, to the point, that his Spells possess the properties and destructive abilities of both elements. Moreover, it easily can be infused with Magnet Enhancement (磁根性強化, Ji-konjō Kyōka, lit. Enhancement with Magnet Nature), which allows the user to create magnetic fields, which grants the better control over the Iron Sand and gives its own properites and advantages too.

Trivia

 * This magic was aproved by Per-chin.
 * The author created this article, because he will need it, soon or later; the author was slightly inspired by Alpha-chin's rush for Slayer Magic articles' creation too.