An Invitation is a request or welcome into one's home. While considered a formality and a sign of politeness in human culture, an invitation has special meaning to the supernatural.

Vampires are bound by supernatural laws that prohibit them from entering a private residence of a living human without a formal invitation from the legal owner of said residence. However, once the owner of a residence is deceased, Vampires are free to enter. Additionally, Vampires can compel others to invite them in. If Vampires seek to enter a residence uninvited, they will find themselves repelled by an invisible and impenetrable barrier.