The Night Blade's Secret Arts (EXS abilities that can affect one's very soul. They are shrouded in mystery and are said to contain the knowledge of EXS itself.) are two powerful
Hundreds of years ago, the Night Blade tried to artificially create even more powerful EXS abilities. When the faction split into the Reformist and Moderate groups, the elder of the Night Blade's village chose to engrave two people with the very source of the Night Blade's knowledge of EXS into two different people in order to stop the conflict between the two opposing groups from escalating. The leader of the Night Blade, Kuon, volunteered himself and his younger sister, Linne, to bear the burden of this.
Hilda is quite interested in both abilities. However, Linne has stated that these abilities cannot be extracted from either her or her brother's bodies..
The Secret Art of Samsara, Reincarnation () is the ability that's carved into Linne's soul.
It turns a person's soul into a parasite that transfers from one body to another once the host's current body dies. This makes it possible to live eternally in a certain sense. After the transference, the host body "remembers" the memories of the Princess of Night Blade. The host body's original personality will coexist with the personality of Linne's, causing a sort of rift between personalities and traits.
The Secret Art of Eternity (Re-Birth, Kuon is nigh-invincible and completely immortal.) is the ability that's carved into Kuon's body. It stops a person's body from aging. By combining this ability and his status as a
|Organizations||Night Blade · Licht Kreis · Amnesia · EFG · Bankikai · Ritter Schild|
|Terminology||Abyss · Autonomic Nerve · Curse Commandment · Dual Moon's One Blade Drawing Style · EXS · FLS · Hollow Night · Immortalize · In-Birth · Indulgence Weapons · Kanzakai · Licht Kreis War · Protector of the Shrine · Re-Birth · Secret Arts · Sistema Celeste · Vessel · Void · Void Red · Witchcraft Village · Zero Vessel|