Starting Party Setup:

WAR
WAR
BRD - Balllad when fighting/swiftsong when running through
BLM
BLM
BLM/THM
WHM
WHM

Buff + eat food outside

Both WAR go in aggro everything drag them to the center, BLM/WHM/THM/BRD nuke/damage..etc

Left sandstorm - WAR + WHM + BLM + THM
Right sandstorm - WAR + BRD + BLM + WHM

Kill everything execept for 1 single ant. Then wait til both group gets to the last one , kill it around the same time.

Next room:
WARs drag all mobs to the center, kill everything . Make sure kill sentries last, they have more hp than most mobs anyway.

Swiiftsong
Next room:
Kill everything except for sentries, make sure peiste gets killed before sentires too.

Swiftsong
Job changes:
BLM - WAR
BLM - WAR
BLM - WAR

Party setup for Princess Ant:

WAR
WAR
WAR
WAR
WHM
WHM
BRD
THM

WAR tank princess to a corner, WHMS buff during fight. BRD give ballad to mages, give paeon to DDs.

THM will be nuking after one WAR does steel cyclone. Sanguine Rite at the right times.

Kill as usual til Marshal pops, another WAR will drag it to the side, but not too far so the marshal will still be able to get aoe'd. Kill guards as soon as they pop. THM and BRD will help kill guard too.

Kill Princess before Marshal will unlock a final chest and achievement.

After marshal dies, small ants will depop, BRD use swiftsong, people will be change job for the remainder of the dungeon. One perosn will be getting the chest, while rest of the party goes to the next room.

Party setup:
WAR
WAR
WAR
BLM
BLM
WHM
WHM
BRD

Buff/cure as you go, one WAR runs in grab most of the mobs, BLM sleepga…etc the other two WAR will target the 2 cactaurs at the end of the hall, need to target the right ones before you aggro or you will get them mixed up then you willl have to kill all cactaurs.

Next room:
Pull one gorup at a time, pieste/doblyns/pieste. Kill as usual.

Swiftsong
One WAR will lead the party to Chimera, the other WAR will go pop other chests and will catch up.

Party setup for Chimera:

WAR
BLM
BLM
BLM
THM
WHM
WHM
BRD

We tank at the northwest corner, and WHMs will stay in range for cures. BLMs/THMs stand at max distance to avoid voice of the dragon.

Our strat involves some kind of dodging for the WHMs. And obviously you need a good tank to dodge the stuff as well.

If everything goes correctly you should beat it under 25min
Good luck!