I'm sure you aren't interested in the latest development of armored elephants or gorillas clad in cerulean blue, so I'll give you a pointer to the mystic power the Sibyls wield:
This is their whole starting gem income, BTW. In Late Age, 4 is the new 5! It's hard to argue with the Magistrates of Man: if a Magister of Mathematics grows bored with you, he'll call the Magister of Theology to "purge" the heretic! It's hard to argue with inquisition.