Index Librorum Prohibitorum/Abilities

* Anime
* Novel
* Manga
* Railgun
* Imaginary Fest

## Abilities

### Ability

**Spell Intercept** (強制詠唱 (スペルインターセプト) , *Kyōsei Eishō (Superu Intāseputo)*?, lit. "Force Chant")

## Debuts

### Manga

Index Chapter 1
 Railgun Chapter 32 (cameo)
 Accelerator Chapter 27 (cameo)

### Anime

Index Episode 1
 Railgun Episode 17

### Video Game

Index PSP Game

This article details Index's abilities.

## Abilities

Despite normally not being able to use magic, Index has a magic name, *Dedicatus545*, "The dedicated lamb protects the knowledge of the strong" (献身的な子羊は強者の知識を守る, *Kenshinteki na Kohitsuji wa Kyōsha no Chishiki o Mamoru*?). As the vessel for 103,000 magical books, she is unable to use conventional means to cast spells; instead, she can only use abilities which intercept opponents' spells.

### Perfect Memory

**Perfect Memory** (完全記憶能力, *Kanzen Kioku Nōryoku*?, lit. "Capability of Perfect Memorization"): Index is capable of perfectly memorizing anything, which is one of the reasons why she was chosen as the vessel for the 103,000 grimoires, magic books that are poisonous to the mind. This made Yamisaka Ouma wonder if Index is even human.

Not only that, but she has powerful analytical skills, able to examine a 30 fps anime easily, as well as making her able to reconstruct an image on a surface, like a balloon or bottle, even after it is destroyed.

### Abilities-related to being the Index Librorum Prohibitorum

*Main article: List of Grimoires*
Index also has abilities that require no mana whatsoever, for they are not of magic, due to the knowledge that she has from the 103,000 grimoires inside of her. This allows her to minutely to pin-point the weaknesses in the spells of others better than anyone in active combat, and later use it against magicians, such as what happened to Angelene, and her poor usage of her magic coinbags in their first battle.

#### Spell Intercept

* Index and her 103,000 Grimoires
* Sheol Fear
* John's Pen Mode
* John's Pen Mode in the manga
* John's Pen Mode (Defense Mode)
* Dragon Breath
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**Spell Intercept** (強制詠唱 (スペルインターセプト) , *Kyōsei Eishō (Superu Intāseputo)*?, lit. "Force Chant", Yen Press: **Spell Interception**) uses Notarikon codes, a quick Kabbalah reading method that uses only the first letter of a word, to interfere with and hijack the spell formula that the caster has been conjuring in their head. When the caster's mind is confused, their control over their own magic is disturbed. It can also be used against magical automatons like golems that are being controlled by a caster, and even against wielders of magical weapons by interfering with their weapon's movements and power. Against powerful magical items like Curtana Original, Index might need some time to analyze their workings before being able to interfere with them. Additionally, it is useless against completely unknown spells to Index (as she has no knowledge of their workings), completely autonomous automatons and spells that are not cast through chants/mental commands.

#### Singing

Singing is a fundamental part of Index's abilities. Using her knowledge she gets from the 103,000 grimoires, Index uses her songs to break down spells and things similar to them. For example, Index uses her singing to eliminate the virus that plagued Last Order's mind, which allowed the Imaginary Number District and Fuse Kazakiri to manifest in Academy City.

A specific form of singing, **Sheol Fear** (魔滅の声 (シェオールフィア) , *Mametsu no Shō (Sheōru Fia)*?, lit. "Voice of Defacement") is an unique ability in the form of choir that points out and impeaches the contradiction of the basis of the religion or theory of magic that has been cast and causes a break down in the enemies mind. This can be bypassed if there are belief systems nearby, such as an Amakusa Christians near a group of Roman Catholics, or when the intended target cannot hear it, such as when the Agnese Forces nuns jabbed their own ears to block off the sound.

### John's Pen

**John's Pen** (自動書記 (ヨハネのペン) , *Jidō Shoki (Yohane no Pen)*?, lit. "Automatic Secretary") is referenced by Index as her "awakening." Here, her voice becomes machine-like and toneless. Her speech becomes blunt and to the point. It appeared when Index's life was in a dire situation, and seemingly makes her immune to pain. She cannot perform magic at this point, and it seems that it's only purpose is to take over Index's body, when she herself cannot do it, like an Automatic Secretary.

#### Defense Mode

According to Index, she is incapable of magic, however, when under John's Pen's defense Mode, she is capable of accessing the grimoires in her mind. It is unknown whether or not she was capable of performing magic before losing her memories.

After Touma negated the Collar symbol put inside her mouth that was meant to kill her, the defense mode activated. Her voice retains the machine like characteristic, and her methods in eliminating enemies is machine-like. While in John's Pen Mode, she was capable of using several very powerful spells:

* **St. George's Sanctuary** (聖 (セント) ジョージの聖域, *Sei (Sento) Jōji no Sei'iki*?, lit. "Sanctuary of St. George", Yen Press: **St. George's Hallowed Ground**): A high-class defensive spell which distorts space-time. Two magic circles over two meters across are positioned in front of Index’s face, each fixed in place with its center over one of her eyes. The circles glow before exploding into something that looks like pitch black lightning. This is described as cracking space open, with the cracks quickly spreading in front of Index and looking like a barrier preventing anyone from approaching Index. Additionally, something that seems to be pulsating swells up from within the cracks, and a beast-like scent wafts in from the slight opening created by the pitch black cracks. Kamijou Touma instinctually realized that the thing inside the cracks was very dangerous, even if he didn't know what it was exactly.
* **Dragon's Breath** (竜王の殺息 (ドラゴン・ブレス) , *Ryūō no Satsuiki (Doragon Buresu)*?, lit. "Killing Breath of the Dragon King"): A high-class offensive spell, used after casting St. George's Sanctuary. The black cracks caused by the previous spell suddenly open and widen all at once. Then a pillar of light, looking like a laser beam about a meter across shoots out from within the cracks. The spell holds the same power of the legendary dragon of Saint George and it can be fired continuously, even as Index moves her head. Upon trying to use Imagine Breaker to stop it Touma found out that his right hand couldn't negate the beam fast enough to counter its power, so the spell started to slowly eat into his hand. He also realized that the beam wasn't a solid mass and that each individual piece of light making it was different, which he speculated might be a result of Index using her 103,000 Grimoires to cast 103,000 types of magic at the same time. The spell has shown to have an incredibly long range, destroying Tree Diagram by accident when fired from Earth.
	+ **Feather of Light** (光の羽, *Hikari no Hane*?): An aftereffect of Dragon's Breath. Anything destroyed by the beam of light will leave no trace behind. Instead, any matter destroyed by it will turn into several feathers of light as pure white as the beam itself. These feathers slowly float down to the ground, and can apparently kill any human who touches them. They seem to work by frying the brain.
* **Eli Eli Lema Sabachthani** (神よ、何故私を見捨てたのですか  (エリ・エリ・レマ・サバクタニ) , *Kami yo, naze watashi wo misuteta no desu ka (Eri Eri Rema Sabakutani)*?, "Lord, why have you forsaken me?"): It's a powerful anti-Christian spell which throws a powerful bloody-red beam of light from a magic circle originating from Index's face. If necessary, Index can turn the Dragon's Breath beam into this spell.
* **Scarlet Stone of Pexjarva** (ペクスヂャルヴァの深紅石, *Pekusujaruva no Shinkuseki*?, Yen Press: **Crimson Stone of Pexjarva**): This spell causes the bones of the feet of the target knee starting to feel a deep pain as the joints between the bones are stretched apart by force. This invisible attack seems to come from the ground and seeps into the body of the target from there.
* **Sulfur Rain will Scorch the Earth** (硫黄の雨は大地を焼く, *Iō no Ame wa Daichi o Yaku*?): An area spell attack that throws about 50 arrows from top to bottom that can drill and burn the target. One arrow is sufficient to turn solid stone into dust.
* During Index's stay in St. George's Cathedral while she was being restrained by Stiyl Magnus, she grows **crimson wings** (赤い血の翼, *Akaichi no Tsubasa*?), which are said to be angelic wings. These wings are powerful enough to destroy and collapse large portions of St. George's Cathedral despite the latter being a highly reinforced magical stronghold comparable to the best in the world. Index was also capable of destroying an Innocentius supported by thousands of rune cards with one swing of the wings, as the destructive power far surpassed the fire being's regenerating properties. She can freely manipulate the size and shape of the wings. The red wings can also burst, releasing and shooting dozens of red light beams that look like sprays of blood at the enemy from multiple angles.
* **Unnamed Shockwave spell**: Sparks fly from Index's forehead, and immediately afterwards a huge fan-shaped shockwave shoots out from her body. The shockwave is strong enough to completely blow away several magicians who were protected by spiritual items and destroy a magically reinforced door of St. George's Cathedral.
* Index has also displayed the ability to summon legendary weapons and artifacts creating multiple copies of the same and use them to attack, all of them 'being able to suffocate the enemy just by floating in the air', some of the weapons mentioned are:
	+ The **Sword of the Harvest God Freyr** (豊穣神フレイの剣, *Hōjōshin Furei no Ken*?) or Sword of Victory, the magic sword of the god Freyr from the Norse Mythology, which the legends said that if someone wise possessed it, it would fight on its own and bring about victory for its owner.

### Information transfer

Index is able to use the knowledge in her mind to make a Gungnir lance. In order to recreate the phenomenon, a magician of great power, skill, and mental discipline is needed to focus its power. By transferring the necessary information to Leivinia needed to draw out the design of the phenomenon from. By singing at ultrasonic frequencies necessary to keep the weapon formed, this continually exposes Leivinia to the knowledge of 103,000 grimoires through the singing putting her constantly in danger of succumbing to them poisoning her mind. Interrupting Index's continuous singing however would immediately result in the destruction of the lance. If it successfully imitated the phenomenon of throwing lance, it would likely destroy the world.

Indeed, Index doesn't need to sing to transfer a thought into someone's head. She can use a high-speed incantation, likely Notarikon, by merely moving her lips.

### Other abilities

In *Shinyaku Toaru Majutsu no Index SS*, Index is able to read the contents of the Book of the Dead, and accurately mimic the voice of the person for whom the Book of the Dead is written for. It allows her communicate its contents with tone and feeling that perfectly matches that of the mimicked person. However, due to the unique property of the Book of the Dead, a grimoire that is different for each person a book is written for, it is likely an intrinsic part of the book and not one of Index's abilities.