An archbishop has the same responsibilities as a cardinal, but is a term generally reserved for specialized positions in which the politics do not allow for a cardinal or a cardinal of a particular faith is unavailable. More recently, archbishops have come to denote the highest administrative figure attainable to pantheonic worhip.
An archbishop is a priest who administers over several bishoprics of a particular god. This can mean anywhere from four to four hundred temples, depending on the god and kingdom. The area an archbishop administers is called a diocese (or sometimes archdiocese). Archbishops are usually attended by a number of paladins, under-priests, and other officials to help them administer the temples in their diocese.
The term 'arch' bishop was originally taken from the Church of Mikindim, where arches are considered a sign of the God of Architecture and Engineering. The Church of Mikindim formalized many of the modern interpretations of the rankings of the priests.