Devil Slayer Magic (Demon) (Vegs)

Devil Slayer Curses, can be considered to be unique paradoxical existences that are a derivative of both Curses, which is the name of the primary fighting style utilized by those recognized as demons, and Devil Slayer Magic, which is the subsection of the Slayer Magic line that grants one the ability to transmogrify their physiology into what could be considered a demon, or demonic. As a result of this, Devil Slayer Curses are most prominent amongst the only real species that can possibly hold them, the species referred to as the Demons of the Books of Zeref, the Etherious. These Etherious are considered to be quite a great deal beyond the level of a regular Devil Slayer, with there being several ways that this power can be obtained and augmented.

Regardless, those Etherious who wield these Curses are still considered Devil Slayers, or Exorcist Mages.

Description
Due to this Devil Slayer form being a curse, the methods of obtaining this particular form of Curse is completely different from the methods of attaining the original forms of Devil Slayer Magic, as the users are naturally modified by the Books of Zeref due to quite literally being made from them. As a result, one of the ways to obtain this Curse is by obtaining it naturally and being inherently created by the Book with the ability to wield this Curse. Alternatively, in a similar manner to the Magic Transfer method, Curses too can be transferred, and this is known due to the fact that Ice Devil Slayer Magic has been transferred itself, though this was not an actual Curse but rather a magic that mimicked its properties. Additionally, a demon who reads the Book of Zeref will not gain the ability to tap into the powers of Devil Slayer Magic, but rather the powers of a Devil Slayer Curse to fit their personal supernatural medium. Utilizing the existence

Trivia

 * This is effectively just the Etherious version of Devil Slayer Magic explained so that it might be used by the individual in particular. Others can make a similar concept,  as this is merely an expansion of a phenomenon seen in canon to a much higher degree.