Final Fantasy XIII HD Long Gui Farming (No shrouds, no summon)

Long Guis replace Adamantoise once you finish the Cie'th missions that form a circle in the Gran Pulse Central Expanse (sorry, I forget the numbers). These things are way meaner, more damaging, and have 16 million HP so I don't recommend even trying them until you are fully maxed out on crystarium and have the tier 3 ultimate weapons for your characters. Also, this probably isn't the most efficient way to farm these things, but I have yet to find another that is consistent (without shrouds and summon)

My setup is Fang with 3x Kaiser Knuckles and Genji Glove, Lightning with the same setup as Fang, and Vanille with a Magistral Crest, Collector Catalog, Connoisseur Catalog, and Genji Glove.

Paradigm setup is
Sen/Sen/Sen (default)
Com/Med/Med
Syn/Syn/Syn
Rav/Rav/Rav
Sab/Sab/Sab
Com/Com/Com

IMPORTANT: If you ever see the Long Gui casting Quake, Roar, or Ultima SWITCH TO SEN/SEN/SEN to eat the damage, or you will most likely die/lose a member. This applies throughout the entire fight. You may want to do this for stomps as well (I do)

Start off with Sen/Sen/Sen and eat the Ultima, then switch to Syn/Syn/Syn and get haste and protectra on each member. If you took a lot of damage from the ultima (member has less than 5k HP) then switch to Com/Med/Med and heal the low members. Switch to Sab/Sab/Sab and get deprotect and imperil on the leg, then switch to Rav/Rav/Rav and break the leg until 900%. Once it's at 900% switch to Com/Med/Med and highwind it to kill it.
Switch back to Sab/Sab/Sab and get deprotect+imperil on the other leg. Switch to Syn/Syn/Syn and cast bravera and faithra on each member (do Fang last). Lightning should enfire everyone as you're doing this. Once buffed, go to Rav/Rav/Rav and break the leg, this time to 700% before switching to Com/Med/Med and highwinding it
Switch to Sab/Sab/Sab and cast Slow on the Long Gui. Continue casting debuffs on it until deprotect, deshell, imperil, slow, and POISON are on it. Poison is important. Once that's done, switch to Rav/Rav/Rav and break the head until about 900% before switching to Com/Com/Com. Just keep attacking it and make sure to throw in a highwind before the break bar is done. The Long Gui should have around half its HP gone
Now, instead of trying to break it again, heal up if needed and rebuff haste and protectra on everyone. Once the Long Gui gets up, change to Sen/Sen/Sen because it will attack you. Sometimes it will do roar+ultima, ultima+stomp, or just one of the 3 so be sure to wait a second before moving to the next paradigm.
Again, switch to Sab/Sab/Sab and get imperil+deprotect on a leg, then Rav/Rav/Rav to break it. If you have bravera and enfire on your character still, switch to Com/Med/Med at 700%, otherwise wait till 900% and highwind the leg to kill it. Repeat for the second leg.
As he's falling down, switch to Syn/Syn/Syn and cast bravera on Fang IF she doesn't have it. Then just repeat the instructions above (debuff to the head, break it, commando it down). This should kill it, but if it doesn't, I guess you can try to kill the legs again, though I've never had to do all that again.

Remember, always switch to Sen/Sen/Sen when the Long Gui is attacking/casting something, otherwise you will probably die. Then switch to Com/Med/Med if needed before continuing on.

Other videos you might be interested in:
Shaolong Gui farming:
   • Final Fantasy XIII HD Shaolong Gui (D...  

Adamantoise farming:
   • Final Fantasy XIII HD Gil/CP Farming ...  

Adamantoise Farming w/ Summon:
   • Final Fantasy XIII HD Gil/CP Farming ...