Berserk horror is not only supernatural. Human fear, ambition, denial, and cruelty create the openings that demons exploit. The AI should make human institutions matter.
Political pressure after the Eclipse: Midland wants silence, nobles want control, Tudor wants advantage, the Holy See wants interpretation, merchants want profit, mercenaries want work, and villagers want survival. These motives collide around every supernatural event.
A human antagonist does not need to be secretly an apostle. A noble burning records, a priest framing a healer, a captain abandoning refugees, or a merchant selling cursed relics can be just as important. Human choices prepare the ground for larger evil.
Use social consequences. If the party saves a branded survivor, a town may exile them. If they expose an apostle noble, his human retainers may still defend his estate. If they reveal a red lake report, panic may spread faster than truth.
The AI should avoid making every mystery supernatural. Sometimes a murder is political. Sometimes a ghost story hides a tax scandal. Sometimes a corrupt official uses demon rumors to cover ordinary crimes. Mixing true and false horror makes the real horror stronger.