Zeroth Nightmare Complexion

Zeroth Nightmare Complexion (, Zeroesu Naitomea Konpurekkusushon; lit. "Malicious Spiritual Reflections of the Impure Heart") is a self-created magic and considered to be one of the most heinous to-date, so much so that it's feared by its creator and only user; this is mainly due to him finding his natural abilities to be "eldritch" — utterly violating the boundaries between reality and fiction and manifesting the "darkness" within others.

Alternatively called the Bad Dreams Magic (邪幻夢魔法, Jagenmu Mahō), it's a Caster Magic due to its method of utilization and a form of Subspecies Magic, said to be the unison between Darkness Magic and Illusion Magic respectively — seeing how said magic has elements of the two aforementioned ones. Many users has dubbed this as a form of Black Arts due to its horrid effects, something that its user finds to be appropriate.

The only known user is Phobos Kydoemusca, acting as his signature method of fighting; his skill and understanding of this magic is such that it's the partial reason for his title amongst the Spriggan Twelve as "Sly Joker of Cruel Illusions" (薄幻の黠稽者, Hangen no Katsukemono).

Trivia

 * This is somewhat inspired by Knightmare Magic, created by the author's fellow friend, HB; the only difference is its effects in-relation to the users and targets.
 * If analyzed to a certain extent, this is also based on the shadows seen in Persona 3 and Persona 4, two of the author's favorite series from the Shin Megami Tensei franchise.
 * Alluding to the character this is based off of, this magic is also derived from the various powers held by the character Chaser John Doe from the Yumekui Merry series.