"You do not need to be a cleric to bring light into the world."
(a Mage follower of Isis, npc suitable for any fantasy campaign with gods of light.)
Magic is a blessing and curse, life and death, birth and undoing, a goal and a way.
Once the daughter of a royal family of the Living Lands, Golden Tears Mistress forsook her family’s ancestor offerings in exchange for the privileges of the court of First and Night-Crowned Wolf.
Real World: some Indians in the Amazon treat their eyes with a traditional potion applied with palm leaves. Brutally painful, the drug alters vision, giving the jungle's dense green walls greater texture and dimension. You could adapt this to desert or swamps, or other hard to navigate regions.