Board Thread:Episode Discussions/@comment-1181222-20181007235146/@comment-35480222-20181008095439

Jason of the Mangekyou wrote: The new opening was better than the episode itself ;_; Yep, who knows what the hell is that kind of ice monster, maybe he is another kaguya's monster like the nue or maybe he is some sort of biju. The whole scene seems far away in time because Mitsuki is back and also Shinki joins the team, moreover it seems they are in the ice dimension.

The monster has some sort of seal on his belly, however he seems pretty weak, boruto kills him just with a rasengan.