There are a handful of legendary weapons you have the chance to find while playing Once Human, but tracking them down can be a challenge. There’s the Fabled Masamune katana that many melee-focused players want to get their hands on, but it doesn’t appear often.
You’ll want to focus on finding it at a particular location. The Fabled Masamune katana doesn’t drop in every location, and even if you’re in the correct place, there’s a good chance you might not be able to get it. It all comes down to repeating dungeons and running through the same content in Once Human, hoping you get lucky enough to find these weapons and add them to your collection.