if you're talking about the big blob thing, then it's some clown thing
The thing that comes out of the ground at the end of the chapter, whatever/whoever it was. Seems like Ookubo has been building up something for Chrona since chapter 60, and the last pages of last month's chapter was Medusa telling Chrona that it was "time". The vector arrows are a dead giveaway for Medusa, the dripping on the body makes me think of the Black Blood, and since the Black Blood/Ragnarok combo allows shape manipulation of sorts, this looks like it could be a next step in Medusa's Kishin human experiment project. I mean clearly something is/has happened to Chrona, and this certainly has the looks of some sort of Black Blood armor/shell combination of Ragnarok, Chrona and the Black Blood.
Edit: Looks like the raw was pulled from MH, so I downloaded it to look again.
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