This information was taken from an Allakhazam post.
You will basically be rushed by about 20 weak mobs at any given time, with small periods of breathing room, until you have killed 200 of them. The cockatrice, puks, and bugards will last about 1-2 melee hits. The Mamool-ja are tougher, will hit a bit harder, and some of them are BLM. AoE weaponskills will kill everything in range but Mamool-ja. I hear good things about tier 2 -aga. Once you have killed the 200th mob, the rest will despawn and the rune will appear at the start.
As you kill them, the mobs will regularly give you temporary items (hi-/mega-/regular ethers, potions, and elixers, wings, max HP/MP drinks, etc.) These don't give you a medicated status, so use them when you need to.
After to kill a certain amount of mamool then a NM Mamool, Bluethunder Kaqool Ja, will spawn.
It is possible that he will not spawn if you do not kill enough mamool before killing 200 mobs. He will drop a temporary key that opens a cage with an npc trapped inside. This will trigger a second wave of troops to assault you. The npc asks to be taken to somewhere safe, you must escort them to the Rune of release. In the next wave a NM wyvern may also appear. After 300 mobs have been killed you will be informed that "You have decimated the enemy forces" and ifyou killed both NM you will get a large amount of points. 1227 with 5 no first time bonus.
I recommend "camping" on the top ledge of one of the rooms, as the mobs will appear and rush you from the bottom. No need to search for them; they'll come to you. BST/BLU worked very well for me here; Cocoon took the already very low damage to almost nothing, I used Healing Breeze in between waves to help the other two people, and my pet killed off a whole bunch of stuff without being told to. I wouldn't count on blink tanking anything here. I don't remember what the RDM subbed, but the NIN went as WAR instead, and they both used a lot of Circle Blade.
Cleared easily with WAR/THF/BRD. Use temporary items for healing and TP as often as needed (they come in easily if you kill fast), autotarget: ON and spam AE weapon skills for faster killing.