Final Fantasy XV timed quest - LVL 140 Dread Behemoth.
I made a lot of mistakes for this quest. I hit him with a Quad Firaga spell which healed him for 9999 HP 4-times. Then I keep forgetting to equip Bow of the Clever when I use Ignis' Overwhelm. If I didn't make these mistakes, the fight would be a lot quicker.
For preparation, eat the Lasagna al Forno in Altissia (or have Ignis make it if you have the ingredients) to negate the damage of Dread Behemoth's insane ice magic.
Use Overwhelm + Bow of the Clever, Armiger + Armiger Chain, and Warp Strikes to deal damage. Don't even bother hitting it normally because of its high defense.
Also, bring lots of healing items because this thing can hit you for 9,000+ damage easy.