One of the inevitable side-effects of learning Witchcraft is the heightened ability to recognize and have to deal with various etheric creatures that, due to being more of the spirit realm, are unknown to modern science. While invisible to normal vision, these entities are no less real or unnatural than any other living being on the planet. Some of them need to be understood and acknowledged as they can have severe and often detrimental effects on living organisms.

The term used for one of these entities is 'larvae'. In life a person's soul within the mortal body is encased within an ethereal shell as well. Upon the 'death' of an individual the spirit or soul of that person abandons the earthly shell as well as the etheric shell that contained it on this plain of existence. When the life energy is removed, the mortal flesh begins the process of decay through the action of microorganisms of a material nature. That still leaves the empty etheric shell that held the spirit in place. This too must be decomposed to clear up the etheric landscape.