Holy Devil Slayer Magic (Aru)

Holy Devil Slayer Magic (聖の滅悪魔法, Sei no Metsuaku Mahō) is a Caster, Lost Magic, and finally, a subsection of the Slayer Magic line, specifically Devil Slayer Magic, utilized by Angelo Serafian and his son, Michael Serafian. Through this magic, they are able to use the element of holy light to kill devils while in battle, making them Exorcist Mages (悪魔祓いの魔導士, Akumaharai no Madōshi)

Description
Through this magic, the user can transform their body with feature of the element of holy light, allowing them to utilize it in both offensive and defensive manners; they can turn multiple parts of their body into makeshift weapons of light, such as hammers or swords, and proceed to bash or slice their opponent with deadly force. The user can also modify the properties of the holy light that they produce, changing it from having immense cutting power to smashing into foes with incredible blunt force, allowing the user to change the properties of certain spells. Another thing to note is that Holy Devil Slayer Magic surrounds the user in a small, barely-felt aura of holy light. While it can not be sensed or identified by normal, the aura of light can be sensed by skilled users of Light Magic, as they can feel the divine element. A user of Holy Devil Slayer Magic is immune to the effect of their own element, in this case being light, and can consume external sources of light to relish their strength. However, much like Slayer Magics, the user is unable to consume the light that they produce themselves and as well as the elements must be consumed through the mouth.

Holy Devil Slayer Magic is the strongest of the Slayer Magics when it comes to the element of light, as it seems that it has the most power-being able to devour the light of its peers. Not only that but, they are capable of manipulating the light of others with simple gestures. However even though Holy Devil Slayer Magic is capable of dealing immense damage against Etherious Demons and their Curses, a user of Holy Devil Slayer Magic is unable to consume curses that utilize the element of light, as they are composed of dangerous Magic Barrier Particles, whereas the regular Devil Slayer Magic's Magic Barrier Particles are considered harmless to the user. It should be noted that for Holy Devil Slayer Magic, it is considered near impossible to learn for humans, as demons of any kind look down upon mankind, and it is unknown how Magic Barrier Particles can merge with a Magic Origin, thus making it an almost literal Lost Magic. Because of this, it was discovered that magicians are capable of learning Devil Slayer Magic from the Books of Zeref and the like, similar to that of how God Slayer Magic can be learnt from several books or for the magic to be transferred over via another user.