i found an easier way to get an light blue vial just a few hours ago, [and i beat the game too]. I decided to talk to some of the random mobs around the map, and I learned at least one interesting thing: Instead of fighting Tortur (can't remember name), talk to him first thing in battle and sell out the buckman that's hiding in it's cell, thne you get the key from him and a light blue vial, what a good deal.