The single most dangerous piece of information from the arc — that the mermaid princess is an Ancient Weapon — leaves the island in the head of a treacherous super-rookie who intends to sell it upward. Confirmed as of Ch. 1108: Caribou has explicitly named Blackbeard as the buyer and is bartering the secret (now bundled with Pluton’s Wano location too) to a Marine for his own survival. Routes to Ancient Weapons. Whether Blackbeard actually takes delivery of the intel is a new open thread forward of this chapter.