A Bull in the Sky is a Mystery Sidequest found in the Mithraeum section of The Order of Giants DLC. You'll find this quest during your foray into the Mithraeum, after Father Ricci leaves you to join the cultists. Here’s how to solve the puzzle moving from left to right:Plate 1 - Medium weight- Medium weight Plate 2 - No weight- No weight Plate 3 - Heavy weight- Heavy weight Plate 4 - Medium weight- Medium weight Plate 5 - No weight- No weight Plate 6 - Light weight- Light weight Plate 7 - Light weightOnce you’ve solved the puzzle, look to your right. You’ll see the Nymphus Artifact in a small opening on the wall. Nymphus Artifact