You start out with the king. After a certain amount of time (~30s?) he summons all the moogles and becomes invincible. When you kill a moogle, he revives the moogles and heals all the moogles to full hp. He uses his own HP to do so. You can do this two times. After the second time he casts a meteor attack that does a decent amount of damage. Everyone will need to be topped off. When you kill a moogle for the third time he starts slowly casting super wumbo attack that seems like it does 10k damage for each moogle alive. (We took 29-30k damage each with 3 moogles alive.)
The moogles also now have combination attacks that wreck your shit. The two tankable moogles do an attack that makes the other tankable moogle do more damage with their attack. So if you tried to have a MT on king and OT on the two tankables the OT will be taking 6-8k hits every dozens of seconds. So you have to have the MT have king and a tankable moogle, and OT has the other tankable moogle. BUT! the king will do an aoe buff around him that stacks. It increases all damage done. So if you let the moogles get to 4+ stacks their super attacks are basically going to wipe you.
So you have to constantly move the king around away from the moogles. Which is not easy considering the rather large range of the buff aoe and how the moogles MOVE WHEREEVER THE FUCK THEY WANT JUST TO ANNOY YOU. But then since the tanks need to each have one of the tankable moogles you need to swap hate on the king. Pom flare and pom cure and etc are generally interrupted by just doing damage to the moogle.
Oh also the king has a cleave that he likes to use that steals like 90% of your mana.
Oh and also at some point the tankable moogles will reverse provoke your healers putting them at max hate and you'll have to get hate back again.