I imagine it something like a combination between hell and plexus. You could teleport yourself inside the Rook's head and by completing a challenge against a Rook ghost (a manifestation of the Rook's bad thoughts) and by finding a special bug inside the Rook's head in 30 seconds (or longer, a bit like the ancestral lands) you could defeat it. If you fail, the Rook will attack the street you're in.