Cortana | Walkthrough

• Find Cortana

The most important rule in this level is to remember that you shouldn't leave enemies behind. Proceed only after the room you're in room is clean. Destroy spores using, for example, assault rifle. Going through the corridors find the Pelican, and remember it's location after all, you'll need to escape this place. You should reach a big cave with mushroom-like rocks on the walls. Stay here for a while, it's time for the next skull.

Tilt Skull

Find the red construction with some kind of open hatch in the middle. Jump on it, then jump left-forward. Turn left and jump on the higher level - then turn behind and jump to the highest level. Pass the narrow bridge and the skull is yours.

Effect: Enemies are less vulnerable to given kind of ammo.

Farther ahead you can find a flamethrower. Leave it though - it's not useful enough against shooting changelings. In the next room move up until you reach the door.

Now you're in the core room of the ship. Shoot to everything that moves and have legs. Destroy all the enemies, then pass the door and destroy the blue sphere.

Nor Hell a Fury

• Destroy the reactor/Escape High Charity

It's time for revenge. Leave this room and enter the core room. Kill all enemies, and destroy three columns one after another. After it's done you need to evacuate. Get to the Pelican as fast as possible, but don't do it in blind panic. Kill enemies you meet on your way and don't let them surround you.