This may sound a bit crazy, but the "without nightvision" was an accident : ) Just wanted to see if it was possible. I didn't manage to beat him on my first playthrough, so I tried on my second playthrough, with 380 affinity coins available or so. I used Melia, Shulk and Seven. When I finally managed to get the right weather for him to appear, I forgot to equip the night vision gems, but I tried anyway. I summoned bolt twice, then kept using earth, ice and fire to slowly remove his hp while trying to survive. I was really close to being wiped out several times, and at the end of the battle, my party gauge was completely empty, everyone had below 1500 hp, and I got a vision that he was going to do his nice fire attack and kill everyone. About 2 seconds before he managed to use it, he finally died from the poison/chill/burn damage and i was literally trembling with excitement, one of my best video game battles ever : ) That fight lasted for 12 game-hours, so about 12 minutes I think? I will probably fight him once more, With the night vision gems this time, it should be a bit easier.