Quote Originally Posted by Kato View Post
New chapter. The battle on the (big) bridge proceeds with some banter and interruptions.
Also, I guess Luffy really is about to unlock a new power. Thank you for the free personal trainers?
This haki force field seems to be a form of advanced CoA similar to how Katakuri's future sight is a form of advanced CoO. Interesting to note that the admirals themselves already showed this advanced CoA when they collectively blocked Whitebeard's DF power.

The black blade might mean that certain conditions or haki usages might enable a permanent "haki enhancement" on weapons, as it did Ryuuma's and Mihawk's.