I think you'll be best served by really doubling down on the "what is their plan now/what was their goal in doing this" question. Remember that daemons' ultimate goal is the cessation of all mortal life; they're not devils who will be content to rule with an iron fist, they're doing this as a step toward annihilation. Figuring out their next step will inform their strategy and tactics for accomplishing it, which will inform how they've impacted the world, which will inform how mortals have responded.