While I had a relatively easy time likely due to my party's relative power, it's mostly about dealing with Raspatil's attack cycle being faster than yours. You need to be in a situation where you can:
- Kill 3-4 medium power adds in less than a minute
- Heal back up to full from being in the low yellow zone in less than 30 seconds
- Be able to stagger a 500% chain gauge within a minute or so
Additionally, Raspatil has two gotchas:
You need to kill all the adds summoned before Raspatil casts Beseech. It will happen after a (somewhat extended) period time after every summon, so you can't stop focusing on adds until the end of the encounter.
You need to manage wounds to prevent yourself from getting into situations where your your max HP have been capped in the yellow zone.
But this is what I used (again, I'm at the end game, but most was overkill)
Serah
- Crystarium: completed
- Weapon: Odinbolt (156/160 fragments)
- Accessories: Hypnocrown, 2 × Durable Magician's Mark
- Strength: 539
- Magic: 1,220
- HP: 6,619
Noel
- Crystarium: completed
- Weapon: Odinblade (156/160 fragments)
- Accessories: Not used (Collector's Catalog and Grimoire Hat)
- Strength: 988
- Magic: 1642
- HP: 8,562
Paradigm pack
- Lightning (RAV): level 13, no infusions
- Green Chocobo (MED): level 99, infused with Feral Speed II and Role Resonance (not used)
- Third slot wasn't used
Paradigm deck
Serah is the party leader.
- Relentless Assault (RAV/COM/RAV) — Default
- Relentless Assault (RAV/COM/RAV)
- Diversity (RAV/COM/MED)
- Aggression (COM/COM/RAV)
- Fifth and sixth slots not used
Strategy
The cycle I used was generally:
- Paradigm juggle1 Relentless Assault (RAV/COM/RAV) to stagger Raspatil
- Use Lightning's Army of One feral link ability to pump the stagger chain up to 750-800%2
- Pump the stagger chain up to 900% in Relentless Assault
- Switch to Aggression (COM/COM/RAV) until adds were summoned
- Only switch to the adds a few seconds after summoned to maximize time on Raspatil
- Kill adds before Beseech
- Switch to Diversity to bring myself back up to the green zone3
- Go to step 1.
Unfortunately, Raspatil's attack cycle is a bit faster than mine, so adds get summoned earlier and earlier in the stagger period, and you start to get too low in health. So after the second or third stagger, I started switching to Diversity and targeting the adds immediately after they were summoned. This provided less time for damaging Raspatil, but kept the situation from spiraling out of control.
After the 5th or 6th stagger, Raspatil essentially lapped my cycle causing me to miss a stagger almost entirely. This was a blessing in disguise, as it essentially resynced our attack cycles.
Once Raspatil was down to 25%, I used Serah and Noel's ultimates when the chain gauge was up to 850-900%. I also started to get a little more aggressive, staying in Aggression longer. Raspatil died while all the adds were active, so I just finished them off and completed the encounter.
Notes
Note 1: To paradigm juggle, perform a full ATB bar of abilities, let them resolve, then immediately switch paradigms: doing so will immediately fill your ATB gauge. This has ~10 second cooldown, so the strategy is usually:
- Fill up ATB gauge in Paradigm A
- Queue up abilities and let them resolve
- Immediately switch to Paradigm B
- Queue up abilities and let them resolve
- Fill up ATB gauge in Paradigm B
- Queue up abilities and let them resolve
- Immediately switch to Paradigm A
- And so on.
Note 2: Because of the Hypnocrown and Feral Speed II, Lightning's Army of One was available once per stagger.
Note 3: If my max HP was 75% of what it should be due to wounds, I took one action during this period to pop a Wound Potion to allow my Green Chocobo to heal me back into the green area.