Cortana - The Key

Rampant

Start moving forward, like fastly. When you can, follow a blue path until you find a sword on the upper area, but then jump back down and head through a round door (it's hard to explain, but eventually a marker will show you where to go if you get lost). Then move forward for a Gravemind moment, and then drop through a hole for a Cortana moment.

There is somewhat of a path for you to follow, but you want to clear out all the Flood with guns. If you stay in the area where you had the Cortana moment, you can find a Bubble Shield to the left. Use it to draw them to you and blow them up with grenades. When you're ready, climb up the slope and head to the right side, not left or you will hit a dead end Pelican. Go right and use the Energy Sword to clear your way. Get through the door for another Gravemind moment.

Keep moving for things to get weird and pass through another door. Then go right and fight all the Flood-things in this small area, or just drop a grenade before they turn. Go up the path and get a sword, then keep moving. Drop down a hole to reach the next area.

This is turning into another nightmare. Lots of enemies in here. Get to a little platform to the right and start hacking away at the many Flood. When they are gone, start shooting at the turret things that are firing upon you. Stay to the right side of the room and drop down to the lower level to find a high-tech room. Go to the center of this room to find an access terminal and have a Cortana moment. Go back out, fight the last few Flood, and get out of here through the path in the back of the room that leads upward.

Kill the pregnant Flood along the path, and soon after you need to make a sharp left turn and run up a slope. Lots of enemies in your way, but just keep running (if you went left then you found a Flamethrower, but that does you little good). Just keep moving up the narrow path until you run into a Gravemind moment, and then a door.

*NOTE: If you have a Cloaking equipment, use it in the part upcoming. And if you don't know what it looks like, just press X and hope for the best.*

In the next room of fun, toss grenades in all directions and swing up the path to the left. Clear some space so you can rest up in the tunnel here. When you're ready, keep following this path, jump across the gap, follow the path around, jump another gap, swing around the path in the wall that leads up, and be sure to catch your breath here. When ready, go up and head left, using a grenade if you see lots of Flood. Catch your breath in this little path and then move on. Swing around until you're back into the open, jump across the final gap, and run through the door. You never had to focus on the turrets blasting you.

Recharge your shields in here and then you get a double-feature moment. Keep moving down the dark path head toward the light and through a door. In the next big room, run to the right and along the walkway. Slash a path and as soon as you can cross the bridge on the left, do so to get to the other side of the room. Then follow the path right, and then take a hallway on the left where you hit another moment before you go through the door.

Go through another door for another moment, and then another door down the way. In the room at the bottom, run to the glowing orb and press B to free your princess. Scene.

Nor Hell A Fury...

Reunited at last. Go through the door ahead of you and keep moving up through more doors after another calling from Gravemind. When you get back out, go left, kill the Flood here, and grab another sword.

Now the goal is to get to the center platform and expose the power things (I didn't see the exact name). From the spot where you grabbed the sword, hop over the rail and run to the button. Push it and take out the Flood nearby. You need to jump to the tiny walkways around each pillar in the room, slash the pillar, and then jump off before it's too late. There are only three, and once you clear out a good number of Flood, you won't be bothered.

After you nail the last one you will need to escape. Follow the path behind the button on the central platform and enter in the red tunnel that opens up. Drop down the hole in the floor and head down the path. You will arrive at what should be a familiar spot. To the left will be that old Flamethrower, and to the right will be a locked door, but you must keep going forward to find the path behind the door.

You end up at a familiar room where a group of Flood will gather at the door. Try to take them out without the need to rush in and hack away with your sword, but if can get by them, slip into the path on the right wall, go right, then go left to find the way out. Follow the narrow path, when you get to a wider area, go left and back out through the door, and then the rest should be cake. Make your way back to the first room of hell and you will find the Arbiter with a Flamethrower. Run to his side and out the back of the cave. Jump into the back of the broken Pelican to be rid of this hell-hole. Scene and end level.