Some people have discovered this and I've seen a few videos where people are speculating, but I haven't seen anyone or any guides mention what the puzzle unlocks or how to unlock its reward. If you don't know what I'm talking about, there are 4 circle pressure plates hidden on the tiers at the Embarkment when you start the raid (similar to the ones found in the KF maze leading to Golgoroth). Facing the entrance, there are 2 on the left and 2 on the right. Each is tucked into a corner and their placements are mirrored on each side. I'm not sure yet whether there's an order to stand on them, though from our experimenting there didn't seem to be any sounds when trying different combinations. What we did find though, was that standing on all 4 at the same time revealed a sun symbol at the center on a plate (about 2 levels down from the top level entrance to the Castellum). It is the same as the designs on the floor inside the Castellum where you place the Standards. There are holes for Standards on the plate, but there didn't seem to be a way to activate the sun and there were no other reactions we could find. No doors opened and enemies didn't come out or react. We are going to try some more experiments , but all answers and theories are welcome. [edit] I've added an approximation of the locations of the plates. I'll try to add screenshots later when I can get on this evening. If you look at the image shown, the plate I spoke of is on the center platform one level up from where you see the set of big chains (above the first set of Centurions) [edit2] Alright, think I've got it figured. At the time I had attempted doing this puzzle the other day with some clanmates, we had previously gotten to the Pleasure Gardens our last run. When we stepped on the plates, it unlocked a doorway in front of the Standards plate I mentioned and above it appeared the Beast symbol. I believe stepping on the plates gives you a shortcut to your checkpoints/the tunnels.