Equip Black Belt and Power Wristband on Lightning and give Magician's Mark and Tungsten Bangle on Hope.

• ENEMY (E-01): Corps Tranquifex (x2) (FIRST ENCOUNTER)
• ENEMY (E-02): Corps Tranquifex (x3)

There is a narrow U-shape path that lead to a dead-end has an item:

• ITEM (T-01): Fiber-optic Cable (x3)

Backtrack a little to your right is a broken sewage tunnel, step off and the mini-map will change. Move forward and turn left for an item.

• ITEM (T-02): Holy Water (x3)
  (left path)
   
• ENEMY (E-03): Corps Pacifex (x1) (FIRST ENCOUNTER)
• ENEMY (E-04): Corps Tranquifex (x1), Corps Pacifex (x2)
   
• ENEMY (E-05): Falco Velocycle (x1) (FIRST ENCOUNTER)
  Strategy 1: RUN! you do not want to fight it at all. This one is meant to be avoided because the moment it uses Gatling Gun, you are dead for sure.
  Strategy 2: If you are determine to fight, here is what I recommend. 
  • Start with COM/RAV, your goal is to destroy it as soon as possible. 
  • You probably won't be able to stagger it before it uses "Gatling Gun". so, summon Odin to tank the damage and fight normally. When the gestalt gauge is about to run out, press "Square" button to enter Gestalt Mode. You should be able to kill it easily with Odin
     
• ITEM (T-03): Librascope (x1)

There are many floating platforms in this area but we will walk through together one by one. First activate a switch in front of you and hop on the elevator. Once the elevator reached the other end, you should notice two switches, the right one will bring you back to where you were, so you should activate the left one because it will bring you to a new platform with two items.

• ITEM (T-04): Holy Water (x4)
• ITEM (T-05): Phoenix Down (x1)

Get back on the elevator and continue:

• ENEMY (E-06): Flanitor (x2) (FIRST ENCOUNTER)
  (The most annoying about this monsters is that they can heal each other or other monsters.)
   
• ENEMY (E-07): Lucidon (x1) (FIRST ENCOUNTER)
• ENEMY (E-08): Flanitor (x2)

Once you reach another elevator, activate the left switch it will bring you to a new floating platform.
 

• ENEMY (E-09): Flanitor (x1), Lucidon (x1)
• ITEM (T-06): Mobius Coil (x2)
• ACCESSORY (T-07): Aqua Ring (x1)

Hop back on the elevator, when it reach the other end, activate the one on the left (the opposite switch you activated previously).

• ENEMY (E-10): Lucidon (x1) (LAST ENCOUNTER)
• ENEMY (E-11): Flanitor (x3)
• ACCESSORY (T-08): Warding Talisman (x1)
• ENEMY (E-12): Flanitor (x2)

• ENEMY (E-13): Orion (x1) (FIRST ENCOUNTER), Corps Tranquifex (x2), Corps Pacifex (x2), PSICOM Predator (x2) (FIRST ENCOUNTER)
  Strategy: There is not much about this battle, quickly spam your skills until the timer is about to hit zero then press "Triangle" to use Diamond Dust. You may not be able to kill the Orion so when Nix and Stiria are out, just summon them again.

A short tutorial pop up about Sentinel role. At this point, you should have accumulated a lot of Crystarium Points, so max out Sentinel, Commando, then Ravager roles for Snow in this order. Synergist and Medic for Hope. Then equip 2 Silver Bangle on Snow. Lastly, add RAV/RAV to your paradigms.

• ENEMY (E-14): PSICOM Bombardier (x1) (FIRST ENCOUNTER), Corps Tranquifex (x3)
• ENEMY (E-15): PSICOM Scavenger (x1) (FIRST ENCOUNTER), Corps Pacifex (x2)
• ENEMY (E-16): Corps Pacifex (x4), PSICOM Predator (x1)

Go straight:

• ENEMY (E-17): PSICOM Warlord (x1) (FIRST ENCOUNTER), Corps Pacifex (x2)
  (Throw 1 Libra on PSICOM Warlord, you only fight him twice)
   
• ITEM (T-09): Fortisol (x1)

Hop on the right path you pass early.

• ENEMY (E-18): PSICOM Scavenger (x1), Corps Tranquifex (x2)

Right path:

• ENEMY (E-19): Corps Tranquifex (x4), PSICOM Bombardier (x1)
• WEAPON (T-10): Paladin (x1)

Continue on the main path.

• ENEMY (E-20): PSICOM Warlord (x1) (LAST ENCOUNTER), PSICOM Predator (x1), Corps Pacifex (x2)

Step off and turn left.

• ITEM (T-11): Insulated Cabling (x4)

Back to Lightning and Fang, your last party member. She is strong and probably one of the strongest character in term of raw power. You probably need COM/MED on your paradigm list as well. Let's save the game and continue.

• ENEMY (E-21): Corps Tranquifex (x2), Corps Pacifex (x2)
• ENEMY (E-22): Orion (x1)
• ENEMY (E-23): PSICOM Predator (x1), Corps Pacifex (x3)

There is also an item behind you.

• ITEM (T-12): Holy Water (x4)
• ENEMY (E-24): Corps Pacifex (x3)
• ENEMY (E-25): Corps Tranquifex (x1), Corps Pacifex (x1)

If you look closely on the mini-map, you can see there is a narrow side area where you can access by hop on the ledge at corner of the L-shape path.

• ITEM (T-13): Incentive Chip (x2)

Step off and continue.

• ENEMY (E-26): Corps Tranquifex (x3)
• ENEMY (E-27): Corps Tranquifex (x2), Corps Pacifex (x1)
• ACCESSORY (T-14): Guardian Amulet (x1)
   
• ENEMY (E-28): Corps Tranquifex (x2), Corps Pacifex (x2)
• ENEMY (E-29): Corps Tranquifex (x1), Corps Pacifex (x2)
• ENEMY (E-30): PSICOM Aerial Sniper (x3) (FIRST ENCOUNTER)
• ENEMY (E-31): PSICOM Aerial Sniper (x1)
• ENEMY (E-32): PSICOM Aerial Sniper (x2)

Rooftop:

• ENEMY (E-33): PSICOM Aerial Sniper (x3)

After you jump down, turn around for an item.

• ACCESSORY (T-15): Shaman's Mark (x1)
  (Remove Tungsten Bangle and equip Shaman's Mark on Hope)
   
• ENEMY (E-34): Falco Velocycle (x1)
  Strategy: Remember this guy? Last time I told you it is better to run from it, but this time is a different story since you have access to Sentinel role with abilities Provoke and Steelguard. Start by casting 1 Libra, and fight using COM/RAV normally until you see "Gatling Gun" on its head, quickly switch to SEN/MED. Once it has used the skill, switch back to COM/RAV and finish it off.
   
• ENEMY (E-35): PSICOM Aerial Sniper (x2)
• ENEMY (E-36): PSICOM Aerial Sniper (x2)

First right path lead to a dead end, so take second right path.

• ITEM (T-16): Thrust Bearing (x3)

Take right turn.

• WEAPON (T-17): Vidofnir (x1)

Backtrack and continue.

• ENEMY (E-37): Falco Velocycle (x1)
• ITEM (T-18): Deceptisol (x1)
• ENEMY (E-38): Falco Velocycle (x1), PSICOM Aerial Sniper (x1)
• ITEM (T-19): 2000 gil
  (Narrow path on your right side)

That is all for now, continue on the main path.

• ENEMY (E-39): PSICOM Aerial Sniper (x3)
• ENEMY (E-40): Falco Velocycle (x1) (LAST ENCOUNTER), PSICOM Aerial Sniper (x2)

Now before you save your game, it is time to use up your CPs and prepare for a boss fight.

Paradigms (Snow/Hope):

• COM/RAV
• RAV/RAV
• SEN/SYN
• COM/MED
   
• BOSS (B-01): Ushumgal Subjugator (x1)
  Strategy: Start with SEN/SYN and cast 1 Libra. After Hope casted Protect, Shell, and Firebar buffs on both, it is time to switch to COM/RAV and RAV/RAV (2 turn each) to quickly stagger the boss but you also switch to COM/MED from time to time to heal. Once the boss is staggered, switch to COM/RAV for damage. Repeat!