Cloaking Magic

Cloaking Magic (隠すの魔法, Kakusu no Mahō) is Dagrim's and his father's signature magic that was invented about 3100 years before the present day; June, X800. As the name suggests, the magic enables the user to cloak and hide people and objects by using this magic but it has wider applications.

Overview
Cloaking Magic works by infusing the user's body with ambient ethernano which transforms every cell in the body into a quasi-transparent matter and brings his body's and whatever he/she is wearing to about the same refractive index as vacuum; allowing light to pass through them, this seems to be the case for every part of their body except their eyes, so they can still see. Due to this, the user is essentially undetectable and invisible for intents and purposes, not even UV light can detect them.

However, due to having a refractive index that is essentially same as that of vacuum's the user is also intangible; that is, they can phase through physical matter and cannot interact with beings and objects in the physical world. They are not only unable to touch people but are also unable to speak or hear properly; they are only capable of sight and can drift away like a spirit of some kind. Dagrim speculated due to the use of this magic back in his days, people must have started rumors about "ghosts" and "apparitions". Nothing can harm the user as long as they don't run out of magic. Once they run out of magic not only will they be reverted back to their original form but they would be exhausted and vulnerable.

Objects can also be cloaked by the users; Dagrim used this to smuggle in ammunition and even military equipment into Vicerza, to face Shin.

Trivia

 * Invisibility and Intangibility goes hand in hand from a rational perspective.