Devil Slayer Magic (滅悪魔法 Metsuaku Mahō) is a Caster-Type, Holder-Type, Ancient Spell and Lost Magic[1] used by Devil Slayers.
Description[]

The effects of learning Devil Slayer Magic too quickly
It is a form of Ancient Spell[1] that allows its users to use a specific attribute or element to slay Demons.[2] It also lets the user eat their respective attribute or element to replenish strength and become immune to its effects like other types of Slayers,[3] even if it is reflected back at them. Likewise, Devil Slayers are unable to replenish from the attribute or element they themselves generate.[4]
Unlike other Slayer Magic, this type allows its users to obtain information about a Demon's anatomy by just observing it for a second,[5] this includes certain abilities such as Curses and Curse Magic.[6] As a function of being an exorcist, Devil Slayers have the ability to kill and/or exorcise any type of demonic power or aspect, given it being the true purpose of the Magic, even removing it from a victim's body just by exerting their Magic Power upon the target without harming the person involved.[7] This Magic is just as effective against Mages who utilize any form of demonic power for combat even with the use of the element in question.[8]
This type of Magic is said to be a mix of their element (ice in the case for Ice Devil Slayers) and dark aspects,[9] if the Devil Slayer in question also possesses a Molding Magic of the same element, they can mold the nature of their Devil Slayer Magic and forge a darker version of their element.[10]
Demonization[]

Gray's Demonization
A notable drawback from excessive use of Devil Slayer Magic is turning the user into an actual Demon, a process known as Demonization. Causing them to "demonize" and becoming afflicted with black markings that spread across their entire body, covering up to nearly half of the user as well as changing the color of the eye on the afflicted side of their body at it's peak.[11] The extant of this allows them to become immune (to a limited degree) to the effects of Curses (including the "Ultimate Curse" Memento Mori, which is supposed to completely annihilate whatever it touches.[11])
It has also been suggested that Devil Slayer Magic is a very fickle Magic, and that learning it too quickly and making use of its properties in rapid succession can have adverse effects on the user,[12] said that the souls of those who hunt Demons start to become "tainted", leading the users of this Magic to progressively lose their sanity, of which can incite them to make irrational decisions.[13][14] Although those who master this Magic are able to summon these markings at will to some degree with medical assistance.[15] This transformation also grants the user enhanced physical speed and strength.[16]
History[]
The origins of this magic are unknown, but according to Viernes, it didn't exist 400 hundred years ago, likely meaning it came to be sometime after the creation of Dragon Slayer Magic.[9]
Styles[]
References[]
- ↑ 1.0 1.1 Fairy Tail (Video Game)
- ↑ Fairy Tail Manga: Chapter 353, Page 6
- ↑ Fairy Tail Manga: Chapter 391, Pages 4-6
- ↑ Fairy Tail Manga: Chapter 391, Pages 17-19
- ↑ Fairy Tail Manga: Chapter 398, Page 5
- ↑ Fairy Tail Movie: Dragon Cry
- ↑ Fairy Tail Manga: Chapter 538, Pages 4-5
- ↑ Fairy Tail: 100YQ Manga: Chapter 33, Pages 2-4
- ↑ 9.0 9.1 Fairy Tail: 100 Years Quest Manga: Chapter 181, Page 7
- ↑ Fairy Tail: 100 Years Quest Manga: Chapter 182, Pages 5-8
- ↑ 11.0 11.1 Fairy Tail Manga: Chapter 411, Pages 3-4
- ↑ Fairy Tail Manga: Chapter 426, Pages 4-5
- ↑ Fairy Tail Manga: Chapter 498, Page 8
- ↑ Fairy Tail Manga: Chapter 504, Page 4
- ↑ Fairy Tail Manga: Chapter 430, Page 3
- ↑ Fairy Tail: 100YQ Manga: Chapter 33, Pages 4-8