Primal Cheats

At the Main Menu, press and hold R1 + L1 + R2 + L2 (hold for about 3 secs). The secret cheats screen should appear. Below is a list of all the avaiable cheat codes.
To enter a code, simply hold X, then scroll left or right on the d-pad untill you reach the desired letter...to move to the next letter, let go of X.
***NOTE: Once you have enter EACH code, make sure you press SQUARE, to activate the cheat.
::CHEAT CODES::
"DEMONISE" - Invulnerability (Makes Jen/Scree invincible to enemy attacks).
"MORTIFIC" - Easy kill (Enemies are killed by one hit).
"SNOWFLIGHT" - Opens the scene selection option up to the end of Solum.
"CHARYBDIS" - Opens the scene selection option up to the end of Aquis.
"FLINTLOCK" - Opens the scene selection option up to the end of Aetha.
"SUNSTONE" - Opens the scene selection option up to the end of Volca (end of the game).
"ARCANUM" - Opens all images in the Tarot Card gallery (as though all cards have been collected).
"SEABREEZE" - Opens 'Actors Featurette' video.
"AURORA" - Opens 'Making Of...' video.
"PSYCHOSIS" - Opens '16Volt Interview' video.
"MIRRORY" - Opens all bonus video's, including 'Trailer' video.
"ASCENDANT" - Opens all bonus video's including 'Coming Soon...' video.
Enjoy!

Finish the realm of Volca to unlock the Trailer Video.

Use one of the following codes for the PAL version of the game.

Invulnerability: DEMONISE
Solum scenes: SNOWFLIGHT
Aquis scenes: CHARYBDIS
Aetha scenes: FLINTLOCK
Volca scenes: SUNSTONE
Tarot Gallery: ARCANUM
Easy Kill: MORTIFIC
Bonus A: SEABREEZE
Bonus B: AURORA
Bonus C: PSYCHOSIS
Bonus D: MIRRORY
Bonus F: ASCENDENT

In the aquis level you have to power up all these filters. so you should
be in a place with dark, dirty water. you'll have to fight some evil
undines so get them out of the way. you'll then see these tentacle
plants, when you swim by they will try to get you but stay near the
ground and they wont be able to reach you. when your past them you'll
see a gate but the power isn't on so the door will not open. if you look
up you should see an entrance into a room, that room is the engineering
room. when your in the engineering room there'll be a map in front of
you. on top of the map there is a button. this button is the button that
opens a huge door that you would of seen when you first swam into the
bay. go into that room (there are no guards in there) and this is the
power plant that you need to operate the doors etc.

Nexus
Card 1: Look for a doorway on the west side of the Nexus chamber. Follow the passageway down to the lower chamber. There is a Tarot card in a crate at the end of the passageway.
Solum
Card 1: Pass through the mill and turn left. Switch control to Scree and climb the outer east wall of the mill. Enter the doorway and look for the glowing card hidden on the second floor.
Card 2: Go to the Valley Tower/Ferai Burrows entrance (where Jen squeezes through a crack in the wall to open the door for Scree). As Scree faces south and climbs the wall, he will be able to pass through an opening in the ledge and get to the level above. Move Scree to the right and climb down to a wooden platform. The card will be here for the taking.
Card 3: Get to after the underground passageway. A third card is tucked away behind the tower. After the Ferai archers have been eliminated, follow the pathway around to the left (passing the lever). Jen and Scree will find a treasure chest. The card is inside.
Card 4: Get to the east/west passage along the south edge of Poor Quarters. As the passage turns to the south and you see a torch ahead, look for the green door on the right. Switch to Scree and have him climb up the wall. When he reaches the height of the second story, turn left and crawl around the corner. Scree will climb down from the wall, onto a ledge. Once past the barrels, he will find a card.
Card 5: Go to the Hunt Camp section. There is an energy stone, energy gem, and energy essence all in one location. Turn left there (as you are facing the Hunt Camp). In the southeast corner of this section is a lodestone. Climb up the outer wall where you found the lodestone, then climb through the opening in the ledge above. The card is sitting on the roof.
Card 6: Get to far eastern section after leaving the coliseum (a circular area on the map where an energy stone and an energy gem are located). Go inside the doorway to the left of the energy stone in the barrel. Through the building and outside, near the bridge, is an energy fountain and a tunnel to the north. Go inside and break the barrels blocking their path. In the back room, they will find an energy gem, two energy stones, and a card.
Card 7: West of Jared's Rooms is a square area called "Malkai Lair". It has an extension to the east with a treasure chest in it. The card is inside.
Card 8: In the room with the statue, there are doorways in all four compass directions. If you take the western door, Jen... 

During one of the cut-scene's, watch where the guys are headed. You'll need to know this, later on in the game.