The year is 2531. In the year 2531, during the infancy of the Human-Covenant war, human scientists stumbled upon a new world. Named "Lumoria", the planet was laden with both flora and fauna as alien as anyone had ever seen before.
Replaces the simple zoom for weapons without scopes with full iron sights. It doesn't simply use an image. The front and back sight actually line up in the center of the screen over the crosshair.