Po-Koro Chisel

The Po-Koro Chisel was a golden-colored carving tool that had belonged to Turaga Onewa.

History
At some point in time, Turaga Onewa came across the Po-Koro Chisel and used as a carving tool. He was unaware that it was actually a "key" to a portal leading from or to the Bohrok nests.

He later rewarded Takua with the chisel when he discovered the infected Comet Balls were the ones causing "The Madness" in Po-Koro, and helped Toa Mata Pohatu with defeating the Nui-Jaga and ending the threat of the plague.

When Takua returned to Ga-Koro, he showed the chisel to Turaga Nokama as proof of his accomplishments in Po-Koro. He was then given the Book of Chronicles from her.

Much later, while being chased by a swarm of newly-awakened Lehvak, Takua quickly inserted the chisel into a golden-colored orb in the middle of the nest, which activated an energy shield bubble around him and took him up through the portal and out onto Ta-Wahi Beach.

Trivia

 * The "head" of the chisel looks similar to Turaga Onewa's hammer.