1. Follow the soldiers to the door and open it via the green button on the right. Once inside the next door on the right is locked. Go up the stairs to your left and take a right before the glass. Take another right and follow the path as it exits onto a catwalk in the next room which is filled with Grunts and Jackals. Take them out going for the Jackals first and then the Grunts.
2. Hit the green button up the ramp to your right to open the gate for the Warthog. Then follow the catwalk down the stairs and hang a left to the next door. Hit the green button to open it. You will be met by more Jackals and Grunts. Take them out.
3. TIP: Don't worry because the Warthog will do most of the work. One of them may get into one of the Ghosts at the end of the hallway so watch out for that.
4. At the end of the hallway open the door on the left, and then get into one of the Ghosts.
5. Go out the door and hang a left. Follow along the path along the building taking out enemies as they come by running them over and gunning them down. There will be a path off to your right that will lead to a small building in the middle of the area. Take out the enemies here and then get out of the Ghost. #Head inside and go up the stairs to the roof. Here you will find a Missile Pod. Use this to take out as many of the Ghosts and Wraiths below you as you can.
6. TIP: If you want the next Skull you have to leave one Wraith intact until after you claim it, otherwise, the skull will disappear.
7. When the Missile Pod is empty you'll have to head down into the dirt area. So hop back into your Ghost and get down there. Take out anything that is still a threat so you can get the next Skull.
   1. SKULL: Catch - Take out all the enemies except one Wraith, and then head to the silo located just off the base of the ramp where the second Wraith is. Here you have to do a grenade jump to get the skull because it's on top of the silo. So throw a grenade close to the base of the front of the silo, because it's the closest to the top, and jump over it just before it explodes. This will rocket you to the top of the silo where the skull resides.
   2. TIP: Some people like to get a Warthog, park it around the back of the silo, out of sight of the Wraith, and then do a grenade jump off of the Warthog. Do whatever works for you.
8. Head towards the Wraith that's up the ramp to your left and take it out. Go through the door on the right. Take a Ghost in there and wipe everyone out that way.
9. The stairs to your left is loaded with Brutes, but if your still in a Ghost just gun them down with that.
10. Go up the stairs, pull a u-turn at the top of the stairs, and follow the path with the pipes. You will meet up with some soldiers. Grab the turret and take it with you as some Drones are about to appear. Take them out and take cover.
11. Head down the steps to the door. Follow the long open corridor where you'll be hit with a Cortana flash. After that, head towards the Mongooses and jump in the driver's seat.
12. Drive out the door that opens and take a left down the ramp into the lake bed. There are Wraiths, Ghosts, and Choppers here so keep moving and let the soldier with the rocket launcher do the work.
13. TIP: The soldier has good aim so all the enemies here are easy to take out so just stay mobile and rely on the soldier.

1. Head back down the hill you came up in the last mission and head back towards the buildings.
   1. SKULL: Fog - As soon as you reach the bottom of the hill look at the burning building on the right. Look to the roof and you will see a Flood. He is going to jump from this roof across to the next one. You have to shoot and kill him because he has the skull.
   2. TIP: Use your battle rifle to zoom in and shoot him down. This can be very hard to do, but don't worry if you miss. You are able to just restart the mission which takes you back to the top of the hill. So all you have to do is walk down and try again.
2. Follow the path through the buildings and once you reach the large door to the building you will see a group of soldiers get attack by Flood. Start killing Flood. They will come at you hard and fast so shoot them as fast as possible, but if they get to close use a melee attack to take them down.
3. Once they've been dealt with jump onto the platform on your right and use the entrance up the stairs. You will see a soldier getting attacked by Flood. When he changes kill him and continue forward.
4. You will find a set of stairs down into the warehouse area. It is infested with Flood. Kill the Flood as you make your way through the warehouse.
5. TIP: Follow the open doors and guide arrows on the screen to help you. It shouldn't be too bad because you've been here before.
6. When you reach the catwalk jump up there and grab the Flamethrower. Then follow the catwalk into a white room and drop through the hole in the floor.
7. After the Cortana flash go out the door and follow the Arbiter. You will enter the hallway with the rusty metal dividers. Follow it and as you do Flood will come around the corners at you. Burn them and keep following the guide arrow and/or the Arbiter until you get outside.

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1. Follow the path inside. You will be stopped by the voice of Gravemind, much like a Cortana flash, but creepier. You will drop down another hole shortly after his first interruption.
2. Keep following the path until you reach a large room with a glowing purple object in the center. Jump up to it and hold RB in order to get Cortana.

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