Prophets generally referred to all existences that could establish a connection with the Holy Spirits and use Their powers to a limited extent. In the era when personalization and worship of the Seven Holy Spirits were still popular, the Holy Spirits Church relied on the power of those prophets to ensure de facto rule over the Vic Continent and was the true overlord back then.
In an anxious bid for quick success, the Holy Spirits Church's brass hoped to resonate with the Authority holder of the Seven Holy Spirits through ceremonial magic. Things ultimately didn't go as planned which resulted in the Seven Calamities, causing misery and suffering. The Church's influence subsequently fell to rock bottom, and the concept of prophets was abolished and swept into the trash can of history.