Well, while some of you guys think up theories about mystical Krypt changes and playable Moloch, I have an idea about the Last Secret:
every once in a while, in a fight at Nethership, House Of Pekara or Lung Hai Temple, I realise that the fight happens without the normal weather condition (common rain in both Nethership and Lung Hai Temple, hail in House Of Pekara), and instead the weather seems clear. I noticed that because House Of Pekara looks way better hail-free. So I was thinking that maybe (for the ones who haven't got it yet) the Last Secret was a way to change the weather in some (or maybe every) stages. What's your take on that?