Zaros brought many secrets with him to Gielinor. Some were from Infernus, some from other worlds he had visited, and some - I think - were of his own devising. He understood the physical needs of the humans and shared the knowledge of how to provide for them with the church and ultimately the whole empire. Though a Pontifex, I was responsible for civil engineering in the whole western half of the empire, and had precious little time for preaching.