Rule One
The threat we will face in the Fourth Arc relates to the “Nothing” Sybil spoke of, so understanding what that means is paramount.
Rule Two
Observe what Ione said in response to Sybil. This is a hint that the threat of the Fourth Arc will arise as a result of thwarting Raven and Spider.
Rule Three
Ione’s response was also a hint saying that the threat of the Fourth Arc will be much, much worse than the threat of the Third Arc.
Rule Four
Sam Johnson, KingsIsle’s Lead Creative Designer, stated in an interview that he wanted the Fourth Arc to be “fundamentally different” from the other arcs in structure.