Long story short, found a link that didn't screw up, so this is coming out earlier than expected, assuming there's no more  

With the crest Gaelijah gave Rinne finally taking effect, draining her before teleporting her the remaining trio of students who actually like each other basically use Sabimaru to figure it out.

As we saw in the preview, Geryon goes to Fuga for help, begging him to save Atropos in the laboratory/house that may or may not be the same one he was hiding in back in episode forty. Transmuting Atropos into Chimera, making a complete doll with no free will, the supreme ultimate life form, a tool of death of destruction, using Rinne, her human model, confirms what was hinted at these past episodes Fuga also guessed:

Atropos is Rinne's model back when she was 17, presumably 18 now, so that explains why Atropos looks like a child. Geryon genuinely seems sympathetic, begging his former friend to save the only light in his life, and despite admitting he can not overlook his mishaps, they'll go to save his daughters.

Plus, he kept Spanner in a safe haven, allowing him to use the laboratory. Given he's gotten on more episode for character development, glad that's getting an explanation if he uses it enhance himself. Next week

Gaelijah noting Rinne's continuing concern towards Atropos despiting getting sacrificed shows the Three Kings only understand humanity and connections on a surface level, she displays so little concern about Clotho running to get Lachesis, probably going to warn her just in case.

But the fathers end up being teleported and imprisoned into the same home Rinne and Fuga grew up in, the same location he read her the fairies tales about the Daybreak Alchemist and the Dark Kings. 

Merging their rings together to make a duel where they have a single bullet and the challenge is to be the first to shoot your opponent dead is pretty tense, especially with the threat she'll turn them into Chimera. And she's just willing to leave deciding to kill them to astrology and her powers.

Still, it's nice Rinne continues to support and not give up on her, no matter what, even as her model she thinks she doesn't have anything in common despite that being so different.

The conversation Fuga and Geryon finally gives us some incite on their past: researching alchemy together, he had resentment that as a Homunculi, he couldn't stomach or fathom Fuga and Rinne's love and their drive to protect every living creature, transmuting Atropos because he saw himself in Fuga, which genuine in love or not, really showed Fuga that he could never truly understand his mind:

Fuga's response is also pretty nuanced. He accepts he couldn't full understand Geryon's perspective, regardless of his homunculus state, he cares about Atropos, for the most part.

Houtarou finally arrives on the scene to find the chair way to enter the pocket gate space for their duel that Gaelijah set as the master and creator, despite Houtaro's attempts to use ExGotcalibur, then using Nijigon as a means to get through. It doesn't work, but his response:

 Using BulletChouChou, the same combination Rinne used in episode five to break through and save the person who entrusted the Gotchard Driver to him and his quasi-girlfriend's fate, he works within the rules by making himself the gun for the duel, slashing and freeing the daughters and father duos from their locale.

The best part is, he used Rainbow Breath to sneak in when he transformed, but the mist blocked it as he replaced the gun, resulting in the surprise attack. 

And it's nice we get both of them reconciling with their respective pairs. And Geryon honestly seems so sweet and sympathetic....until he uses his cube to modify and alter Gaelijah's spell to put the crest under his control: using Rinne as fuel to make Chimera a superweapon.

And Atropos finally, finally learns the hard way her sisters and Rinne have been warning her about the whole time: her entire love for her was a lie, having Atropos siphon her life force after admitting he was never there to save her. It's really depressing because Fuga was genuine about having respect that could be regained and Geryon actions did seem he actually had some humanity garnered from his experiences. But that's the trap:

He's an abuser. Abusers, aware or not, are good at making their victims see the signs. While love bombing itself is a tricky subject to discuss, he put the cold shoulder on the other siblings to make her feel like she was the special one of the group. He put her in tough situations and apologized for it without considering the risks. 

He built her up so she would be devoted to him and see her father as someone who could do no wrong. She was so motivated to him that after his first death, she carried out his goals and ideologies. Even as she saw the risks to be had with her sisters leaving and turning themselves into a monster to try and bring them together. 

Everyone continued to reach out to her but she still persisted she could trust him: that he alone understood her, resurrected him from transmutation, and at first she seemed to be right. He offered all of his daughters to come back, was understanding of Clotho going to Gaelijah, and gave his older female colleague some closure. He even treated Atropos the same with Fuga and Rinne when she was a child.

But it was all a ruse in the end: he didn't have a child to understand his own jealousy and find genuine love and value within his own offspring, to him, she was just a tool to be exploited, used, and manipulated for whatever he wanted.

Every abuser, especially parents, see their child as a puppet for them to use. How many times do we here about it: a lover, friend, best friend, friend group, parent, exploiting innocent people for their own gain and consent. They show them love, then slowly break them down, physically, mentally, financially, socially, until they're the only person on their mind. And when they're done using and taking advantage of people, they just move onto the next person with no remorse for their well being: as if they never mattered in the first place.

The sadder part is she was born, made, created, just to model and be the cause of something's suffering: she was made to hate someone who by all intents and purposes cared about her more than her own father, despite all the things she did to her, because Rinne knew deep down she was a victim, constantly trying to sever the strings controlling her.

Even Drive touched upon it, Banno made an entire group of species and the first thing he did was physical force on as a proxy for his own revenge by turning his face into someone who rejected him so he could beat on them until Krim caught him in the act.

This just gets heartbreaking as Rinne explains to Atropos she has always wanted to use Alchemy to make people happy, continuing to fight till the bettter end, as Gaelijah unleashes a blasting forcing he friend, dad, and Geryon after her.

That's when Rinne's memories get through to Atropos: no matter how many times she attempted, she refused to try and let her plans get solid in more blood, called her out on wanting to be her friend, making her own rules and path, trying to get her on the side of good.

Then she decides to honor her promise, using her telekinese technique to try and repel the blast at the cost of her own life: admitting her jealously, Fuga's love, misguided, accepting Rinne wanted to be her friend, apologizing for the difficulties he made her. 

Giving time for the guttural screams from Rinne and the shock on Clotho's hands who probably went to Lachesis to try and warn her just makes the scene even harder.

But Rinne gets back up, transmutes Atropos' triangular cube into a golden ring of her own, evolving the Alchemist Driver into the MajestyDriver, and upgrading the Sun and Unicon cards into their Twilight forms: Dancing in The Dark, Two in One, she gets her Final Form: Twilight Majade.

The suit is pretty good, the cape evokes Wind, but the colors enhance the base Majade suit. Gaelijah's able to predict her attacks, but it's revealed Atropos is now inside and merged with Rinne, so now they can fight together: and Gaelijah can't predict two people in one body. Between the sick full body axe kick, "as you wish" to agreeing for them to fight together, creating a field of meteors.

Gaelijah questions why we resist our fate and fall victim to rage in sorrow thus our reliance on astrology and abandoning humanity, but Rinne resolves that allows us to get our own choices in life. Thus Twilight Majade finishes her off with a cool spin kick that drills through the Dark King.

But Atropos promises she'll always be a part of her while Fuga gets to be proud of his daughter once again.

Geyyon seems satisfied, about to claim Gaelijah's part of the Philosopher's Stone, only for Geryon to snatch it back and demand loyalty, but of course the rogue doll is going to go rouge.