Invisibility in Welt

Invisibility is a state where an object cannot be seen. Invisibility can be general (nothing can see the object), selective (only certain things can see the object) or anti-selective (only certain things cannot see the objects). 
The term refers to objects that cannot be seen through natural, magical or technological means. The ability can be achieved naturally, as an ability certain creatures exhibit, or naturally occurring perfectly transparent materials. The ability can also be achieved by magical and technological means. 
Invisibility is often considered to be the supreme form of camouflage, as it does not reveal to the viewer any kind of vital signs, visual effects, or any frequencies of the electromagnetic spectrum.
The term is used when objects cannot be seen by magical or technological means; however, its effects can also be demonstrated by certain lifeforms, particularly in incorporeal undead beings and certain animals.
== Magical invisibility ==
When invisible, a user can move about an environment unseen by others and act without being observed. While this ability gives the possessor a considerable stealth advantage, the ability does not suppress sound, so the possessor must make special effort to be quiet while using their ability. Invisibility also does not appear to render the possessor immune to infrared, and thermal detection. Possessors must also be aware of other secondary effects they have on the environment (footprints; opening or closing doors) which may also render them susceptible to detection. Another form of invisibility displayed through magic is cloaking powers, this ability allows the user to make other objects invisible.
== Natural forms of invisibility ==
Invisibility is a limited form of Illusion, where the possessor can affect the visual cortex of anyone so that the possessor cannot be seen. This works by the user emitting a certain pheromone that affects the visual cortex, making the user completely transparent to the target, who is unable to see the user. Those who possess this specific ability are immune to this effect from others, and thus can see others with the same ability even when this ability is active.
=== Truly transparent materials ===
Since objects can be seen by light in the visible spectrum from a source reflecting off their surfaces and hitting the viewer's eye, the most natural form of invisibility is an object that neither reflects or absorbs light (that is, it allows light to pass through it). This is known as true transparency, and is seen in many naturally occurring materials, though only few can achieve 100% transparent.
=== Scaled mirroring ===
A natural form of invisibility where a creatures body is covered with modified eyes who project what is seen to the other side of the body, making the creature functionally invisible. The mirrors resemble the compound eyes of a fly, and are called scales, hence the name. A natural resistance to this ability was found in detecting the thermal or air currents that does not pass through the creature. 
=== Incorporeal Invisibility ===
This form of invisibility is displayed by the incorporeal undead. The actual mechanics of this ability is theorized to be that the entity uses ectoplasm as an energy source in order to become completely transparent. This ability requires standing in shadows as a primer, which is thought to be the entity “copying” the shadow. The giveaway of this ability is that it leaves ozone and excess ectoplasm as a residue.
=== On natural invisibility ===
Most invisible creatures know they are invisible, and as a result have few predators and are indifferent to the rest of the world around them as a result. 
Craftian Spiders are the best example of this. Craftian Spiders are gigantic spiderlike creatures with tentacled faces who cling to buildings, quasi invisible, observant and indifferent to the people below. They feed by filtering dust in the air, and live for very long due to extremely slow metabolism. They can be seen through a specific lens or using an Ectospectrometer.
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