Hollow

A Hollow, also known as a Void Soul, is a person that does not leave any traces visible to supernatural senses. Most notably, although not lacking a soul, a Hollow does not manifest an aura, making them nearly untraceable to all supernatural beings. People with the Sight find Hollows unnerving, as they perceive only a void where the Hollow's aura should be.

Since most magical artifacts interact with a person's aura on some level, Hollows are unable to use them. Likewise, they are also immune to most curses and spells, as they tend to hone in on a person's aura. However, it is worth noting that while a Hollow may be immune to the actual magic of a curse or spell, they are not immune to physical dangers created by said magic.