NE: 4 man it with BRD RDM DD BLU. If you can afford a 5th, get a BLM.
head butt spam is very good here. also its useful to have a blu with magical blue magic setup here.
1F just wait patiently and pull the white and black FAT mandy, kill it, and kill boss.
2F go for the NM bird first, remember to silence because mascure elegy and horde sucks. If no timer from this NM, just kill another NQ bird or 2.
3F Kill huge ass robot
4F Find the right gigas to open portal. if you get unlucky that the portal gigas is Cronos(the one that immune to physical) get BLU to spam magical blue magic on it and RDM sleep > grav nuke too.
5F farm Dhamel and just open the chest to exit. no need to kill manticores