You drop into a pool to start the level. Kill the Tentacle overhead, get out of the water and proceed to the massive doors. Examine the area but beware of the Skaarj that attacks from behind. Open the big stone door by pressing the raised stone face on the wall behind a barrel that you need to destroy.
Go through the door and proceed until you reach an outdoor area surrounding a fortress. Find the Assault Vest, Healing Fruit, a torch and other goodies then go to the front doors of the fortress and into the entry hall. If you shoot the crucified Nali hanging on the fortress wall it will reveal a secret message on the fortress itself.
In the entry hall are two locked doors downstairs, a stairway and lift leading upstairs and two more locked doors upstairs. Scour the area and kill the Skaarj, when they have all been killed the upstairs doors unlock. Take either door and proceed along the hallway, kill the Skaarj and note the locked doors leading to the interior of the fortress. Grab any ammo you can find. When you have killed all the Skaarj in this hallway another door opens automatically on the other side of the hallway. Inside is a console with three levers. Press them all and the doors leading to the centre of the fortress slide open.
Walk through one of the doors onto a long circular balcony overlooking an arena, Kill the Skaarj on the balcony and collect all the gear. When you are ready, and after saving the game, drop down to the arena floor. Stay away from the central structure with the Nali hanging from it.
Walk around the edge of the arena and note the three gates and the stairway leading underneath the arena floor. Return to the main arena floor, when you are ready approach the central structure. It’ll rise up along with the three gates. One of which contains a Titan. Behind the gates is extra ammunition, healing fruit and a shield belt. The best way to kill the Titan is to always keep the central structure between you and it. Use the Eightball and ASMD, watch where the Titan is headed and fire Eightballs at the spot where he will be. Use the ASMD to shoot his arms and legs, if you wait until you can get clear shot at the body, the Titan will get a good shot at you.
When the Titan is dead, the wall behind one of the gates will fall, walk through into a room with a lever, throw the lever to open a door at the base of a stairway and walk downstairs. Proceed along the corridor and the next level will load.