Beat Atelier Iris: Eternal Mana's Bonus Dungeon!

Well, if it wasn't for the fact that I completed the bonus dungeon on Atelier Iris: Eternal Mana. Well, I had to first level up all the way to 99 because the monsters were so strong, besides they were all bosses that I had defeated in the main game! Most battles I just ran, but I fought the easier ones. At the end, the ultimate boss attacks you, and man he is so tough even at level 99! I used a party of Lita, Delsus and Klein for this fight, all with their ultimate weapons and best armor. I HAD to keep Klein alive at all costs, or else I was doomed. So, I hit him with a lot of hard hitting attacks, and after a long fight, I was relieved to see him go down. He had like at least 50000 HP, compared to the main game's final boss' 32000 HP.