Umbryel
Luffy touches an ancient relic connected to Joy Boy and becomes completely emotionless - cold, distant, brutally honest, and reckless because he no longer cares about anything.
The Straw Hats panic and try everything, but nothing works.
They call Ace, who rushes to help, but even he can't reach Luffy.
The crew sails to Elbaf, where the giants send them to the Elder of Memory.
The Elder reveals that Luffy's emotions weren't erased - they were sealed behind an ancient wall.
To break the curse, Luffy must experience a powerful emotional shock strong enough to pierce the barrier.
If he doesn't feel anything before the next full moon...
he will stay emotionless forever.