Pathfinder: Wrath of the Righteous

Easy to miss, done in the first act.

During the assault on the Heart of the Protector, care must be taken to ensure that the arsonist cultists do not completely burn down any of the buildings. So always give priority to them and only then attack everyone else. These enemies appear in the same places, so first remember where they attack from, and then place Oil and Web spells in those places to make fighting them easier.