Nabu, in his final act, passed his Helm of Fate to Detective Chimp and tasked him to find one worthy of the mantle. With his death, the 9th Age of Magic had ended and the 10th Age of Magic begun.
Nabu's final act led to the transfer of his Helm of Fate to Detective Chimp, who was tasked with finding a worthy individual to assume the mantle. Nabu's passing marked the end of the 9th Age of Magic and the beginning of the 10th Age of Magical Power.