I am trying to determine why I do not have an option to purchase the 500 score sweet dreams blue print from the vendor. I have it for the merciless but not sweet dreams. I know if it was available for both I would have bought them from the vendor at the same time? I have 450 sweet dreams and haven't gotten another one to drop yet. I did however get another merciless to drop at 497 so I am wondering is that is the reason. Do I need to get a sweet dream to drop at a gear score above 450 to be able to buy the 500 score blueprint. These exotic blue prints are not very clear how they work.