When i did Dragon's Neck recently the main problem was that only me and one other player had White Wind. So if both of us got Imped, we would wipe. Still, it requires some coordination, while anyone can WW, you still need someone to tank hits. So if/when your dedicated tank gets imped, someone should pop MG and get aggro from Ultros. Also the only unique spell in this Trial is 4-tonze weight. You can learn Snort and Aqua breath from Carnivale 20. And Aqua Breath is available from Levi as well.