Dalham seems to be about level 72, judging from how it hits and takes damage from local pets.
The number of attacks this monster gets each round increases as his HP drops. He will start the fight with normal attack speed, only hitting once per round. As his HP drops (about 70%) he will use a "2 Hour" animation and begin attacking twice per round. At about 40%, he will use the "2 Hour" animation again, and begin attacking 3 times per round. He will use it once more around 10~15%, attacking at near Hundred Fists speed.
Builds resistance to Bind and Gravity extremely quickly.
A level 75 THF/NIN can solo this monster with capped Marksmanship, Blind Bolts, Bloody Bolts, and some decent evasion gear.
A level 75 NIN/WAR can solo this. Good evasion gear, and enfeebles are needed. meds reccomended.
A level 75 RDM/NIN can solo this melee style with some effort.
Has an Additional Effect: Water damage for about 21~ damage on a 75THF.
After it is dead click the ??? again for a cutscene.
The NMs all /say something when they use their 2h. The NIN says, "Through this we ssseek our just reward..." The Assassin's say, "...Take up thy laternsss. The truth we shall illuminate." The Nin's 2h can also be wasted by a person kiting it and staying out of range. The NIN will always use Mijin Gakure exactly 3 minutes after he spawns his buddies.
The SMN has a random elemental pet. It will often use the Astral Flow of the same element, so you can try that Barspell. Its Astral Flow does about 800 damage to a level 75 player if not resisted. Note, the SMN Cryptonberry can summon TWO pets at once, so ignore his elemental, and be careful as he gets low on HP.
After the Tonberry or Tonberries are dead click the ??? again for a cutscene.
It is possible to only defeat one of the Tonberries and still successfully complete this part of the mission and receive the cutscene. Once all four Tonberries are popped, if your party loses all Enmity (due to a wipe, etc.), the Tonberries will return to the ???, refill their HP, and despawn in the order that they reach the ???. If you manage to pull the last Tonberry before it despawns, you can kill that one and still get the cutscene.
Remember to Dispel its Defense Boost special (Scutum).
It has about 7600 HP, and will use Blood Weapon at low health.
Easily soloed as 75 RDM with Bind, Gravity, and tier III nukes. Bind and Gravity resistance builds quickly. Alternativly sub NIN and kill it slow and steadily. Will take some time so make sure you are prepared.
After it is dead click the Storage Compartment again for a cutscene.
The crystal propulsion unit of Cid's airship has been damaged. You are to call Louverance back from Carpenters' Landing, and Shikaree Z from Bibiki Bay. You must also find the Chebukki siblings in Tavnazia and retrieve the vessel of light.