To get the Legendary Sword in Blox Fruits’ Second Sea, ensure you are at least level 700 and have completed the Military Detective’s quest. First, find the Manager at the Cafe. Speak to the Manager to learn when the Legendary Sword Dealer will appear.
Pay attention to the Manager’s dialogue. If he says “Are you new to this island?” complete the Colosseum quest. If he says “It’s still too early for you to be here,” wait 10 minutes. If he mentions pirates seeing the dealer on a nearby island, the dealer will spawn in about three hours. Keep checking back based on the Manager’s hints.
The Legendary Sword Dealer can appear in seven locations. These include the top arch at the Colosseum’s northeast side, the waterway under the Kingdom of Rose, a leaf on the largest beanstalk in the Green Zone, behind rocks near Fajita in the Green Zone, atop the pillar in the Graveyard, near the Factory close to Jeremy, and inside the central house on Remote Island.
Once you find the dealer, you can purchase one of three swords: Saddi, Shisui, or Wando. Each sword costs 2 million Bellus. To get the True Triple Katana, buy and upgrade Saddi, Shisui, and Wando, ensuring you have 300 Mastery on each sword and $2M. Happy hunting!