Any of the win requirements for making the JSE weapons (20SKCNMs on difficult or and of the High-Tier battlefields on normal) doable with 3 + trusts? More specifically BLU + THF or DNC + BLM.
Probably your best bet would be to have the BLU and THF or DNC both sub NIN and do the Antican BC (vs BLM WAR RNG PLD).
- Summon 3 support trusts. I highly recommend Joachim for Elegy and -na spells, and having 2 WHMs would probably be wise since you'd want to play defensively. Of the WHMs, I'd include at least one that can cast Haste. Summoning Ulmia instead of a WHM does give you double Marches and some variety of Madrigal/Minuet/Ballad, but she won't cure or anything.
- The BLM should sub WHM and keep at a safe distance. On Difficult, I don't believe the enemies can be slept, but I think you could Elemental Seal Silence the BLM Ant when it gets to using Manafont. Stona/Silena your WHM trusts, and throw out nukes when you see a safe opportunity. Keep defensive buffs like Blink and Stoneskin, as Ants have a hate reset move. Also use Barstonra and Barpetra on your party to help reduce the chance of petrify.
- Your THF or DNC person has benefits on either job: THF should be able to dish out more damage, and can Larceny the PLD's Invincible or the WAR's Mighty Strikes to give you a great advantage at those moments. DNC, on the other hand, has Fan Dance, stuns, Haste Samba, cures, and erases. I'd recommend whichever job this person feels more comfortable and practiced on.
- Between the BLU and the other melee guy, figure out who is more durable/better at blink tanking and have them get initial aggro. Whoever is less durable should help by grabbing hate on one of the other Ants (I'd recommend the WAR). Don't fight this ant just yet though, just get hate on it so you don't have 1 guy tanking too much. Of the other two Ants, leave them untouched so they don't develop any hate.
- Focus on killing the BLM Ant first because he is the weakest and generally will dish out the most damage if ignored. If you're concerned about survival, Unbridled Wisdom can help tremendously in this first phase. Thunderbolt and Bloodrake are incredibly valuable in a clutch.
- Between the WAR and PLD, consider fighting whichever one the back-up tank guy isn't holding, so that between the 2 melees, you both have 1 ant, and then the one you're fighting is bouncing hate between you. Note that the WAR is gonna dish out more damage than the PLD, but the PLD will take longer to kill. Overall, if you've killed the BLM ant, you're mostly sitting pretty.
- Kill the RNG ant last.
- Bring Echo Drops, you will definitely need them. Bringing a Vile Elixir and a +1 might be wise too, especially if the BLU runs low on MP.
- If you're still having a really hard time with this and finding it too overwhelming, you can always shout in town for help. Lots of people need Rem's Tales and are glad to help without asking for anything.