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Robin finds a broken Sky Poneglyph on a floating ruin. It mentions the "Fourth Ancient Weapon" (a fake-out – it’s actually a map to a lost library). Sanji protects her from Mist Serpents.

The crew lands on an island where ships fight in a gladiatorial arena. Franky enters Sunny in a non-lethal "Ship-Fu" tournament to win a rare metal needed for repairs. Brook provides music. one piece episodes wiki

Nami uses her Clima-Tact to create a lightning rod, channeling a natural storm into the guardian beast. She earns a new log pose that can detect "emotional magnetic fields." Robin finds a broken Sky Poneglyph on a floating ruin