Halo Reach Nightfall Walkthrough, How to Complete Nightfall Alone on Legendary
Part 1:… Too Quiet
This level is very dark, making it hard to see. If you are having a hard time seeing, turn up the brightness in the audio/video section of the start menu. You can also use 38 super ammo for sale your night vision by pressing left on the D-pad.
You begin this level on top of a cliff with a 46 ammo sniper rifle, 96 ammo magnum, and sprint. After walking along the edge of a cliff, you will turn to the left and come to the first set of enemies; two sleeping Grunts and an Elite minor with his back towards you. Jun warns you of them just before you turn the corner. This Elite has been programmed to be very unobservant, and will not see or hear you as long as you stay behind him. Walk up directly behind him and press the left bumper to assassinate him, then kill the sleeping Grunts with headshots or melee attacks. Where the Grunts slept, the path splits into an upward and downward route. You should take the top path because it will allow you to temporarily avoid and ultimately flank the enemies on the lower path.
The upper route will lead you to a strategic sniping point over the enemy settlement below. There is a health kit, assault rifle, and hologram armor ability here. Get behind the large rock to the right for cover and survey the area ahead of you. The targets that you should be looking for are four Elite rangers and an Elite spec ops, all equipped with either needle rifles or focus rifles. These are the only Elites in the settlement that you can kill with a single sniper rifle headshot due to their low shield capacities. They will always stay on top of roofs, though the Elite rangers will often jetpack between roofs. Kill all of these Elites with sniper rifle headshots, using the rock as cover if they return fire.
For beginning snipers: When sniping these Elites, follow them with your reticule when zoomed in 5x. When they stop moving, zoom into 10x and move the reticule onto their heads. When a dot appears inside your reticule, fire once to kill them. This will usually cause the other Elite rangers and Elite spec ops to return fire. They are armed with accurate weapons, so pose a threat even at this distance. Once they begin firing upon you, return to the safety of the rock for cover. When they temporarily stop shooting, move a small amount out of cover, just enough that you can shoot them without exposing your entire body. Repeat these steps until you have eliminated all of the enemies. If it is too hard for you to achieve sniper rifle headshots, two body shots will kill these Elites as well.