Astarte can probably teach Humanity (and other scrubby sentients xD) how to use magic to illuminate areas with incandescent light and cast both protective spells and enchantments, meant to calm the mind and diminish dark creatures' power. That includes lalu and his people.

Though only the ones who actively practice magic would be able to cast such spells, I imagine many sentients will willingly choose to practice at least that little bit of magic in the current situation.