mystic eyes of death perception

A type of Mystic Eyes that are considered to be such a rarity that they are thought not to exist at all.

Under the Noble Colors System, they are designated as Rainbow, the highest level, and are considered Divine Spirit class Mystic Eyes.

They are possessed by Shiki Ryougi and Shiki Tohno (Remake). Also Michael Roa Valdamjong (Remake) in the body of SHIKI Tohno (Remake) displays a similar ability.
The Mystic Eyes of Death Perception can be called a circuit that opens up in the brain and eyes to allow the user to "perceive death," the conceptual "Death of an Existence," as visual signals in the form of Lines of Death (死の線, Shi no Sen?) and Points of Death (死の点, Shi no Ten?). Although Shiki Ryougi only sees the Lines of Death, certain Lines act as the Points of Death that Shiki Tohno would see. Their usage is not entirely dependent on the eyes of the user, as they can still "see" lines should they go blind or gouge them out. Rather than "seeing," it is more like they are "observing" everything at a higher level. "Death" is invisible to normal people, only accessed through perceiving the natural flaws with overly strong spiritual sight by looking through channels that normal people cannot perceive. In perceiving death, it can be said they see the Root itself. They are descended from the eyes possessed by the Celtic god, BalorWP, which were able to actualize death simply by looking at the target, and they have not been possessed by anyone else since then until now.The ability to perceive the death of a being or object depends entirely upon the user's perception of death. The brain and the Mystic Eyes work as a set, so having different "specs" allows for great differences in the users' abilities to perceive death. They show the death of things, the weak points where everything is most easily broken and the imperfection in everything that will break down one day. They can be said to see the fate of all things, seeing the future, allowing them to see death. While there is a difference as to when a person or object will "end," it is certain that they will all arrive at that point because death is not something that "arrives," but rather is something already contained within an object at its creation and certainly bound to happen as part of the principle of causality.

Anything with an origin must have an end, a "time of death" determined at the beginning, and as it already exists, it is not impossible to comprehend such a concept with the appropriate circuit in the eyes and brain, allowing them to be viewed as though a microscope. It is normal that cutting a living being's neck would kill them, their life stopping because it was cut, and conversely not being able to cut a being's neck would mean that they will not die. The eyes can ignore the cause, instead allowing them to kill even that which is immune to all external effects. That which is cut falls apart and that which is "killed" becomes "dead," but rather than "tracing the lines causing the object to fall apart" and the object becoming dead because it was cut, it is "ending the lifespan and killing the object." It is the erasure of existence rather than physical destruction, so the object is "stopped" and the cut is the end result.

While Tohno's eyes are normally gray, they glow with blue while utilizing the Mystic Eyes of Death Perception after removing his Mystic Eye Killers. Ryougi Shiki is able to shift her focal point to prevent herself from seeing the lines of death, returning her eyes to their regular appearance. Looking at the world as she normally would activates her Mystic Eyes of Death Perception, granting them a blue hue.