Ifrit doable without LNC + Sentinel?

[Junpei]

This should easily be doable. Hellfire only pops about 2.5k damage without sentinel.

Defender (MRD 10) and Stoneskin (from your mages) should mitigate about 600-800 damage.

If the DD stack on top of one of the mages following this for a curaga 2 and pray your tits off that he does a tripple dash so you have time to recover your hp/mp

I would say that the tank at least definitely needs it(sentinel) if you have some DD that dont.

You will also likely need 3 mages to pull it off without LNC. A fight like that is likely to be in the 15-20 minutes time range assuming it goes smoothly and you'll need to be droping extra cures on the DD that may be getting seared.

My group has done it with 2lnc 2mrd 1pug 2con 1tha

notably 1 of the lancers, 1 of the marauders, the pugilist and 1 conjurors did not have sentinel. we still beat it fine.