Those who hold a Bushido NFT and Daitō NFT will have the chance to burn both to receive a new character class, the Ronin. This is a free mint for holders, you just pay gas.
This burning event, known as Seppuku, will begin March 4th at 10AM EST and end March 7th at 10AM EST, or until the mint limit of Ronin is reached; 2,000 total. Any Ronin that are left unminted will cease to exist.
All of the details, as well as Ronin art, are available on Medium: https://medium.com/bushidos/seppuku-event-introducing-ronin-158e731f03d3