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 finds a derelict ship flying the mark of the Spade Remnants (a rogue faction of former Baroque Works agents led by a mysterious swordsman). Zoro recognizes the sword style. one piece episodes wiki
A flashback episode: Jinbe recalls sailing this same route with Fisher Tiger. He must navigate the Sunny through a cursed reef while being taunted by a ghostly apparition of Arlong (hallucination). Robin finds a broken Sky Poneglyph on a floating ruin
The rival captain reveals they want the "Eternal Mist Compass" to find the grave of a legendary pirate. Luffy refuses to fight for treasure. A three-way battle erupts with the island’s guardian. The crew finds a derelict ship flying the