Articles concerning terminology from UNDER NIGHT IN-BIRTH.
“The Manifestation, EXS(Exist) (顕現(イグジス)) is the source of an In-Birth's power and what Voids...EXS
“The False Born, In-Birth（偽誕者(インヴァース)）are individuals who control the supernatural powers of EXS...In-Birth
“The Reborn Ones, Re-Birth (再誕者(「リヴァース」)) are people with powers that transcend those of normal...Re-Birth
“Indulgence Weapons (免罪武器(めんざいぶき)) are ancient weapons that are linked to EXS abilities...Indulgence Weapons