Astral Projection

Astral magic is a Gray magic that allows a person to remove their spirit from their body.

Description
Astral magic allows the user to become a spirit, while their original body sleeps. They can freely move and come in contact with objects; however, in this state, their original body is vunerable and if their body is destroyed they must either find another body to live in or they will wonder the world alone. As a projection, they are invisible (or as Arashi says 'less noticeable'). This means that they aren't really invisible but people don't really notice them. Only certain type of magic users such as cambions or a user with the ability to see spirits can actually see and communicate with them well. Spirits also leave an invisible thread that connects the spirit to the real world, if the thread were to be cut, they would die.

Depending on the user, they can accidently slip out of their body without realising, this is very dangerous depending on where the body is left. This is why it is important to master their skill.