I honestly never expected to see that mantra stuff again. Looks like Oda is finally connecting the dots for us. All of these strange abilities that were never linked to devil fruits seem to revolve around around this haki. Pretty sweet chapter.

As far as the duplicate devil fruit thing goes...I'm going to just assume this was Vegepunk's doing. We know that he's developed tons of breakthroughs in devil fruit usage, and he was already able to duplicate that admiral's light attack across a bunch of the pacifistas...