Isle of Spires is the twelfth and final Black Box collectable in Horizon Forbidden West.
Transcript[]
RECON PILOT: No, no! They just cut the Harris in two. The remaining ships are concentrating their fire on the lead Horus, but there must be six more coming in behind it. And there are several ashore and moving inland further up the coast.
Copy that. We'll keep eyes on. But whatever this Zero Dawn super weapon is… you'd better use it soon or there'll be nothing left.
Location[]
Found in the Isle of Spires among the aircraft wreckage, east of a Charger Site.