Minimal issue to 4box with WHM/SCH BLM/WHM MNK/WAR THF/BLM(I use stun bots, get over it). If not multiboxed, there's 0 reason a 4man group should have any trouble without stunbots(all moves have sufficient readying time).. just make sure to have two stunners.
I'm sure BLM/WHM THF/BLM and NIN/WAR is viable for an absolute lowest-possible deal, but would require more attention and be a longer fight. You want two stunners to catch all thunder4/thunder5 and lithic breaths. You can let fulmination go off, the height difference with mages up at #7 and melee at the bottom of the ramp is sufficient to avoid it. If you use a THF/BLM or other stunner that doesn't have native dark skill, you're going to want triple m.acc atmas(ultimate/merciless matriarch/impregnable tower) and ascetics available. I find that if I buy an ascetics, use it, and buy another the combination will last long enough to run there and stun until it dies.