To obtain it, rename any sword/axe on the anvil. Works with Optifine or modification "Cit Resewn" (Fabric)

Here is the naming guide: https://docs.google.com/document/d/1gkkQ1W__MAyGtcnCvOL838d10cEE5HtsY1J1VAIA7fM/edit?usp=sharing.