A few days ago I was out and about, just leveling up, making the best of my one month unlimited access. And (I can't remember where I was) guess what I stumbled upon while with my friends?
A Darkfire cutlass!
Please don't ask me where and how I got this. I'm very forgetful and i can't remember >.<
But my best guesses would have to be Beckett's Quarry, or a cave at Raven's Cove (you go all the way up the cave to the Idol with the ghosts all around them)
sorry if this wasn't helpful.