An organisation within but also opposed to the Church of Prios led by Father Sarvola (and now Elsana). They aim to restore the pantheon of the gods to the religion of Ambria, as well as reinstate Prios with his former duties, something that Queen Korinthia has neither condemned or condoned. Huberdo was on a mission in SY11. The Howling Of Damned Gods, Part I to kidnap Elsana and bring her to their cause. The party managed to convince her to join the Reformists, rather than join the Realm of Order.
A common theory is that the queen no longer has use for the loyalist Curia - that their militant style was perfect for winning the war and founding the new kingdom, but that they were now an issue for her in peace times. There has been a lot of friction between the queen and the Curia, and the Reformist church would now be a much more preferable option for her.