Well I too was gone for like half a year so just guessed since haven't seen you post in a bit. Yea also want to learn more about these "black blades" Mihawk stated his and Zoro just got one and it was just mentioned a bit by Zoro and Ryyumu in the arc. I don't think will get any other hints until the strawhats reach the country of Wano to be honest though. Then again who knows what might happen at Mihawk's place.