Patron
Patron is a term that is given to an Arweinydd who makes a deep connection to a living world in such a way that both the world and the Arweinydd have evolved during the process. Often, this Patron also has interacted with the people of that world and sometimes has even pledged protection over a group people or entire civilization.
The Patron Dragon of Nefol
The most common example is Zemi Dreigiau, who stood as the Patron of both the city of Nefol and the Nefolian world during the Dreigiau story.