
Truth Shrouded in Mist
Behemoth King
This is a Priority Petition and is only available from Montblanc in person. There are a lot of legends in Ivalice, and so far they're turning out to be pretty much all true. If stories tell of a foul beast capable of crushing cities underfoot, then even if nobody has ever seen it or has any evidence of its existence at all, it's probably out there anyway.
The Behemoth King is a real test. You will need to be stronger than the storyline ever requires, and should make sure you have put in some serious training first.
Petitioner
Koqmihn; Old Dalan's, Lowtown
Encounter
The Edge of Reason, The Feywood
Prepare for a tough time drawing Behemoth King out. He will only appear if there are no other enemies around in the Edge of Reason and the Ice Field of Clearsight. You will need to travel between the two, exploring thoroughly and ensuring nothing remains. This is made doubly difficult by the Feywood itself; the dense Mist interferes with your minimap meaning you can't see any red dots, and it causes hallucinatory reflections of your party to appear throughout the blizzard conditions. On top of that, because you can't leave for a save point without the enemies respawning, you must face Behemoth King immediately after clearing the areas.
Reward
250 gil, 2x Bacchus's Wine. Yup.
When you report your success you will be told of a new treasure. Head to Mt. Bur-Omisace and attack the wyrm skull on the Temple Approach for 500000 gil and a Rod of Faith. That's more like it.
Slaying Behemoth King is such a feat that you'll earn the Lord of the Kings Den achievement for doing it.
