Ok, this is ridiculous! I'm a level 50 guardian. My T7 haven't been upgraded ever! I did the puzzle but the chest won't open! I tried it at least 30 times, I could get him to 50% hp. I tried several tactics written here, read all the 41 pages of posts but not even that helped! I haven't invited anybody to help me because this should be solo doable! I'm sorry but I just can't believe those guys who said they did it easily and were only on 80% of their hp. I've been playing this game because of the story, not the mmorpg part. And this comes and I just can't finish the story. Serious changes should be made to that fight, really soon!