Go to the yellow mark. After the cutscene, three portals will appear, side portals teleport you back to either Gran Pulse or Eden while the middle one is still inactive.

We don't to go back to Gran Pulse or Eden, we want to finish the game now. So this dungeon is a one-time visit meaning that treasures and monsters in this area will be lost after you completed it, so make sure that you collect everything and kill every monster (including collecting intel). If you look at the map while facing to the Save Point you see 2 paths (yellow mark on the right), so we want to go left first:

• ENEMY (E-01): Sacrifice (x2)
• ENEMY (E-02): Aquila Velocycle (x1)
• ENEMY (E-03): Aquila Velocycle (x1)
• ITEM (T-01): Librascope (x1)
• ENEMY (E-04): Megrim Thresher (x1) (FIRST ENCOUNTER)
• ACCESSORY (T-02): Cherub's Crown (x1)
• ITEM (T-03): Millerite (x1)

Backtrack and take the right path (yellow mark). When the statue brought two hovering platforms, take left first.

• ITEM (T-04): Supercharger (x4)
  (dead-end of the right path)
   
• ENEMY (E-05): Aquila Velocycle (x1)

Hop down to the side area on your right.

• ITEM (T-05): Perfect Conductor (x4)

Then go down the ramp.

• ITEM (T-06): Turboprops (x5)

Backtrack and hop on the other side area.

• ENEMY (E-06): Aquila Velocycle (x1)
• ENEMY (E-07): Megrim Thresher (x1) (LAST ENCOUNTER)
• ITEM (T-07): Particle Accelerator (x2)
• ITEM (T-08): Uraninite (x1)

We are done on this part, Backtrack to previous statue you talked to and take the other hovering platform.

• ITEM (T-09): Seeking's Beard (x20)
• ENEMY (E-08): Dagonite (x1) (FIRST ENCOUNTER)
• ENEMY (E-09): Dagonite (x3)

Go up the ramp on your left to second floor.

• ENEMY (E-10): Sacrifice (x2) 
• ITEM (T-10): Aegisol (x2)
  (at the corner)
   
• ENEMY (E-11): Sacrifice (x3)

Go up the ramp on your right.

• ACCESSORY (T-11): Gale Ring (x1)

Backtrack and hop on the other side.

• ITEM (T-12): Tear of Woe (x9)

Go back to the floor below and continue.

• ENEMY (E-12): Dagonite (x2)
• WEAPON (T-13): Shamanic Spear (x1)

Save your game and talk to the statue. Turn around and follow the yellow mark.

• ENEMY (E-13): Sacrifice (x1), Aquila Velocycle (x1)

Take right then straight and hop down.

• ENEMY (E-14): Sacrifice (x2), Dagonite (x2)
• ENEMY (E-15): Sacrifice (x2), Aquila Velocycle (x1)
• ACCESSORY (T-14): Tetradic Crown (x1)

Backtrack and go to the yellow mark. Once the hovering platform stopped, go straight.

• ENEMY (E-16): Dagonite (x3), Aquila Velocycle (x1)
• ENEMY (E-17): Dagonite (x2) (LAST ENCOUNTER), Sanctum Templar (x1) (FIRST ENCOUNTER)
• ITEM (T-15): Starblossom Seed (x6)

Backtrack and go to the other side.

• ENEMY (E-17): Sanctum Templar (x1)

When you see another Sanctume Templar, hop down to side area.

• ITEM (T-16): Black Mycelium (x8)

Backtrack and continue.

• ENEMY (E-18): Sanctum Templar (x1), Sacrifice (x1)
• ITEM (T-17): Rhodochrosite (x1)

Then follow the yellow mark.

• ENEMY (E-18): Sanctum Templar (x1), Sacrifice (x2)

Save your game before talking to the statue and prepare for a boss fight.

Paradigm (Lightning/Fang/Hope):

• MED/SAB/SYN (default)
• RAV/COM/RAV
• MED/SEN/MED
   
• BOSS (B-01): Jabberwocky (x1), Bandersnatch (x1)
  Strategy:
  • Start with MED/SAB/SYN and throw 1 Librascope for intel.
  • Focus on Bandersnatch first, when Fang casted Imperil and Deprotect on him, switch to RAV/COM/RAV. You can have Lightning spam her "Army of One" to quickly raise stagger meter.
  • Once the small one is dead, kill the big one using the same strategy.
  • Heal if needed.

When you are teleported back to the Cradle, save your game and talk to the statue causing the platforms to change again. In this area, only Immortal is the new enemy which is the big guy in front of you guarding a portal.

• ENEMY (E-19): Immortal (x1) (FIRST/LAST ENCOUNTER), Centaurion Blade (x1) (IF SUMMONED) (FIRST/LAST ENCOUNTER)
  (Make sure you wait until it summons the blade.)

Once you killed it, use the portal to teleport to the upper level.

• ACCESSORY (T-18): Adamant Bangle (x1)
• ACCESSORY (T-19): Weirding Glyph (x1)

Use the portal again to lower level.

• ITEM (T-20): Elixir (x1)
• ITEM (T-21): Scarletite (x1)

Use the portal again and you are back in front of the Immportal. If you already fought every battle from previous dungeons, you should have all intel from enemies here so you CAN avoid them without fighting. Just go straight to the yellow mark.

Paradigm (Lightning/Fang/Hope):

• MED/SAB/SYN (default)
• RAV/COM/RAV
• MED/COM/MED
   
• BOSS (B-02): Wladislaus (x1)
  Strategy:
  • Cast 1 or 2 Libras.
  • Start with MED/SAB/SYN until you have enough buffs. While Fang should have sticked Deprotect on him.
  • Switch to RAV/COM/RAV and have Lightning spamming her "Army of One".
  • Switch to MED/SEN/MED for healing and always keep an eye on your health bars because this guy can deal serious damage.

Now you are back to the Cradle, just follow the yellow mark. This time, you are in an open area with an elevator and a ramp, both take you to the top but we'll take the ramp because it has treasures along the way:

• ITEM (T-22): 3000 gil
• ENEMY (E-20): Sanctum Templar (x1), Wladislaus (x1)
  (if you haven't got his full intel from previous fight, you should be able to get it here.)
   
• ITEM (T-23): 5000 gil
• ENEMY (E-21): Jabberwocky (x1), Bandersnatch (x1)

There is another Wladislaus on the other side but we'll pass.

• ENEMY (E-22): Sanctum Templar (x3) (LAST ENCOUNTER)

Talk to the statue and prepare for another boss. doesn't it look familiar?

Paradigm (Lightning/Fang/Hope):

• RAV/COM/RAV (default)
• MED/SAB/SYN
• MED/SEN/MED
• COM/COM/RAV
   
• BOSS (B-03): Tiamat Eliminator (x1)
  Strategy:
  • Start with RAV/COM/RAV until you staggered it. Spam Lightning's "Army of One" to quickly raise the gauge.
  • Once the stagger meter depleted, it'll drop on the ground and vulnerable to debuffs, so switch to MED/SAB/SYN to stick Deprotect and Deshell on it.
  • Once debuffs sticked, Switch to RAV/COM/RAV then COM/COM/RAV to knock it off.
  • During the battle, use MED/SEN/MED when you need healing.

Take the portal to the final boss.