What an insane chapter. The escalation ramped up like crazy.
Okay, so Tolka's master was Santa all along. I don't think anyone saw that coming, and it was a great twist. It looks like Santa was a special type of puppet that Master created by giving it certain human emotions where it can look and act like a normal human after it becomes a puppet, and that is also what Tolka became. Then she can use it for devil contracts instead of having to sacrifice herself for them. That is clever. Now I wonder how old Master is if she has been controlling Santa for decades seemingly. Also I wonder what her real goal is if she took contracts from both Germany and the USSR to go after Denji.
But man, that whole scene with the Hell devil was amazing. So that is what Santa/Master needed the 4 kids for. She used 3 of them and then Santa's heart to summon the Hell devil and bring everyone in that building to Hell, but she also turned Tolka into her new special puppet so she can control him and see what is going on in Hell without having to go there herself. I guess that final kid that wasn't sacrificed might be who Master will groom into her Tolka replacement? That panel with the finger taking the kids was so creepy. The finger was even drawn reaching over the edge of the panel really giving it the feeling of something beyond normal devils.
Then that six fingered hand reaching down and bringing everyone inside the building to Hell was so good. I wonder what exactly a six fingered hand represents, but the whole look of Hell is just so bizarre. It looks like a field of flowers and an abandoned bathtub, but the entire sky is covered in doors. I guess that door Pochita told Denji to never open really was a door to Hell. Now that Denji and the Chainsaw devil's heart are back in Hell I really have no idea what will happen.