Mirror Images/Dragoon

I just did this at DRG/BLU and it was terribly easy. Meds I used were icarus wing, fish mithkabob, yag drink, pamama au lait, rr earring. Gear was a normal /war or /thf setup, you want dmg fast and hard. Before entering I set my fellow to Soothing Healer, I wanted no chance of her tanking since I couldnt heal her myself. Upon entering use the icarus wing, rr earring, and fish mith. Advance until you can draw your weapon against Vassago but stay out of agro range, then cast Cocoon, and take both drinks. As soon as you engage use penta-thrust, then high-jump + jump. He will use Blighted gloom at this point so super-jump the first one and your fellow will return a blessed radiance to him. Use penta as soon as you get tp, and be ready to move behind your fellow to avoid blighted gloom. I forgot to the second time he used it and dropped my hp to 140-ish, but a quick footkick and a cure4 from fellow had me fine again. Cocoon never wore, its a VERY short fight, and 3 pentas finish him. His normal attacks never did more than 50 to me since my defense was over 350, which is awesome for lvl 50. Best of luck to all, I hope this helps.