Dark Day is a mod that will make the world a lot darker by removing daytime and giving you a permanent blindness effect, can you survive in eternal darkness ?
World:
With this mod installed, minecraft worlds will get stuck at night time and you will get a permanent blindness effect:
Enchantment:
Sunlight: Sunlight is an enchantment that can be set to helmets and will give you a temporary "Light" effect which will remove the blindness and let you see at the cost of XP.
