First, let's pick up some treasures here on F1.

• ITEM (T-01): 4721 gil
• ITEM (T-02): Sparkbane Brooch (x1)
• ITEM (T-03): Chipped Fang (x12)

Then save your game and take the elevator (yellow mark) to "Second tier". When you walk a few steps further, a cutscene will occur, a new path is opened, and a tutorial pop up telling you that you must complete "missions" in order to continue. Now get inside the room and talk to the statue to activate our first Taejin's mission.

• MISSION 21: Gelatitan (x1)
  Reward: Speed Sash (x1)
  Strategy: 
  • This guy is easy to Preemptive Strike.
  • First throw a Libra for intel.
  • Start with COM/RAV/RAV until the stagger meter is around 750%, then switch to COM/COM/RAV to finish it off.

The statue for mission 22 is in the same room.

• MISSION 22: Ambling Bellows (x1), Cryptos (x2)
  Reward: Particle Accelerator (x3)
  Strategy: 
  • These guys are also easy to Preemptive Strike.
  • Throw 1 Librascope for full intel on Crypto so that you don't have to come back later for its intel.
  • Start with COM/RAV/RAV then kill the Ambling Bellows first or it will keep calling its minions and the rest is easy.

The statue for mission 23 is also in this room. The mark is in the middle where you activate mission 20.

• MISSION 23: Gurangatch (x1)
  Reward: Warrior's Wristband (x1)
  Strategy: 
  • This guy is very easy to Preemptive Strike.
  • Throw 2 Libra for full intel.
  • Start with COM/RAV/RAV and stagger it until around 700% then switch to COM/COM/RAV.

The fire blocking your path is now extinguished. Before you go to the next section, pick up an item at the end of the path.

• ITEM (T-04): Spark Plug (x5)

And another one in the middle of the staircase leading to F3 (third tier). Once you reach F3, activate the statue in the second room so that the main elevator can reach to F4 (fourth tier), this is not a mission statue. The layout of the tower will align and a door will open. When you go out of the door, turn right first for an item then turn around and take the elevator to F4.

• WEAPON (T-05): Simurgh (x1)
• ACCESSORY (T-06): Metal Armband (x2)

When you arrived F4, go to the Save Point direction and pick up an item:

• ACCESSORY (T-07): Glass Orbs (x2)

Then get inside the room and take another elevator to F5 (fifth tier). Turn around and pick up an item then activate mission 24. The Mark is right next to you.

• ITEM (T-08): Ancient Bones (x9)
   
• MISSION 24: Mushussu (x1), Yakshini (x2)
  Reward: Moonblossom Seed (x6)
  Strategy: 
  • They can be Preemptive Strike.
  • You might want to throw 1 Librascope first so that you don't have to come back later for intel.
  • Start with COM/RAV/RAV and take this chance to take out Mushussu first while they are staggered. 

After you killed mission 24's Mark, take the elevator back to F4, then get out of the room and walk pass the main elevator outside to another room with another elevator to F6 (sixth tier). There are 2 treasures on your way.

• ACCESSORY (T-09): Gale Ring (x1)
• ACCESSORY (T-10): Rainbow Anklet (x2)

Activate mission 25 when you reach F6. Right now, you cannot reach the Mark yet so go the room with yellow-circle mark and talk to the statue. The tower layout will re-align again allowing you to have access to another room with a staircase to F5 where the Mark located.

• WEAPON (T-11): Tears of Woe (x4)
• WEAPON (T-12): Unsetting Sun (x1)
   
• MISSION 25: Vetala (x1)
  Reward: Cobaltite (x1)
  Strategy: 
  • I don't it is possible to sneak up on this guy, let me know if can. So, we'll have to fight it face to face.
  • Start with COM/RAV/RAV, immediately throw a Libra then try to stagger it as quickly as possible. This guy should go down in 2 staggers.
  • If you health is low switch to SAB/MED/MED.

Pick up a Librascope in this room then talk to a statue in the next room to activate mission 26. You probably notice a Tyrant in this room too. This guy can summon Centaurion Blade so make sure you let him summon the blade and cast Libra for intel.

Next, head outside and walk toward another statue to trigger a cutscene.

• ITEM (T-13): Librascope (x1)

The Mark is on F6, so make your way back upstairs you'll see the Mark is in the last room.

• ITEM (T-14): Tear of Woe (x4)
   
• MISSION 26: Penanggalan (x1), Chonchon (x4)
  Reward: Diamond Bangle (x1)
  Strategy: 
  • This one seems impossible for me to Preemptive Strike, let me know if you can.
  • Start with COM/COM/RAV, immediately throw a Librascope then auto attack on Penanggalan, Fang and Lightning will use Blitz and Ruinga until those minions are dead then focus on Penanggalan using COM/RAV/RAV.
  • heal if needed.

The ice blocking the statue is melted, so head back to the statue by following the yellow mark. The main elevator can now reach level 6 but you cannot access it from this part of F5. So follow the yellow mark again to F4 and from F4 you can take the main elevator to F6. Finally, follow the yellow mark again and don't forget to pick up an item near the elevator.

• ACCESSORY (T-15): Clay Ring (x1)
• ITEM (T-16): Tears of Remorse (x8)

Save your game and walk in circle to pick up two items.

• ITEM (T-17): Ethersol (x1)
• ACCESSORY (T-18): Frostbane Brooches (x2)

Prepare for a boss fight.

• BOSS (B-01): Dahaka (x1)
  Stategy: This guy is pretty easy.
  • Start with SAB/MED/SYN then immediately throw a Libra on him.
  • Once Deprotect stick on him, switch COM/RAV/RAV until the stagger meter is around 750% then switch to COM/COM/RAV. This should bring him to phase 2 (health below 50%)
  • He will start casting nasty spells on you, so be prepare to heal and always keep your health green. When all debuffs wore off, switch back to COM/RAV/RAV and COM/COM/RAV. he should out on second stagger.

We are not done with Taejin's Tower yet. You may have noticed another Cie'th here on the apex, it is mission 27. Go ahead and activate the mission, also there is another floor we haven't visited. Walk around and talk to the statue at the outer ring. He'll activate another elevator for you. Take the elevator to F7 then talk to the statue here, the layout of the tower will change for the last time and you now have access to every floor from the main elevator.

Head outside and pick up an item along the way then take the elevator to the apex.

• ACCESSORY (T-19): Collector Catalog (x1)

The Mark for mission 27 is on the ground floor, but for some reason, you cannot fight the Mark if you take the elevator from F7 to ground floor. That's why I told you to go to the apex first, then save your game and take the elevator to ground tier. The fight is a hard one so far.

• MISSION 27: Penanggalan (x1), Chonchon (x4)
  Reward: Blaze Ring (x1)
  Strategy: 
  • This guy immune to all debuffs so you'll have to start with SEN/MED/SYN instead.
  • Cast 2 Libra.
  • Wait until Hope casted buffs on all everyone, then switch to COM/RAV/RAV for 2 or 3 turns and switch back to SEN/MED/SYN for healing and recast buffs because it can remove your buffs from time to time.
  • Once it is staggered, switch between COM/RAV/RAV and COM/COM/RAV for full damage. It should go down in one stagger.

That is all for Taejin's Tower. Take the main elevator back to apex. From there, take another elevator on the side that takes you to Oerba village.

Note: if you didn't have full intel from mission 21 to 27, you can now go back to the statues and reattempt the missions.