Laws of hospitality

Right of Hospitality or Guest Rights is like a sacred pledge of safety and guest privelidges among the old world supernatural community.

Description
The Code of Honor of the Old World was accepted and expected when negotiating between between various supernatural factions. A Sworn Oath and the obligations of Hospitality were more binding than the threat of violence. A being making such an oath would be obligated to protect the other person from themselves an others making a threat. Failing taht duty would be a serious loss of face and respect. Word would get around.

In the Series
In Blood Rites, Lara Raith makes an oath to extend their truce and to give Guest Rights to Harry Dresden so long as he is at her home.