The Morneon splinter sect known as the "Hell Evangelists" has attracted many followers who were seeking spirituality and enlightenment.
They had no sociopolitical agenda, and were only seeking to further an objective understanding of black magic. However, there have been some recent schisms within the sect. The more radical faction does not seem to care for morals or common decency.
Even if their interests and the kingdom's were aligned, working with this faction would not benefit Hydeland in the long run. As such, the kingdom has decided to cut ties to this cult.