As a Moments page, per wiki policy Spoilers Off applies here and are unmarked.
In the Prologue, it starts with Bayonetta and Singularity falling as a pink and green comet back down to Earth respectively. Then it becomes a fight splitting Gommorah and a Homunculi against each other in one plane and Singularity vs Bayonetta in another. Sure, it ends up being a Hopeless Boss Fight just to showcase what kind of threat Singularity is, but Bayonetta puts up a stellar fight before the end.
This moment becomes even better when you consider that at the final chapter, Prime Bayonetta fights Singularity Chaos, destroying it with a mixture of Queen Butterfly and Sin Gommorah, then goes up to space to fight Singularity Balance, beating the other Bayonetta souls out of him before they crash down to earth... exactly as in the prologue. This may imply that Bayonetta 0 may have fought the same fight as Prime Bayonetta had, but unfortunately she didn't have Bayonetta 1 or 2 helping her.
The Demon Slave ability. In the past two games, Bayonetta would briefly summon infernal demons for individual attacks and executions. Now? Not only can you choose what demon to summon, they can perform whole combos this time! Further upgrades to this ability allow Bayonetta to use Wink Slave, summoning the selected demon as a combo finisher by pressing the right button when Bayonetta flashes purple at the end of a combo, and Assault Slave, which summons the demon for a counter-attack just before being struck by an enemy.
Even better, how do we get this reveal? Gommorah gets upset when his latest meal isn't from Paradiso, and is about to turn on Bayonetta just like he did in 2... prompting Bayo to break out the Demon Slave. Rodin calls it "one art [he] thought was lost for good" - which means Bayonetta dug this up just to stop her demons from turning on her again. Considering she and Jeanne are the only Umbra Witches still alive, the fact that she managed to (a) learn about this technique and (b) figure out how to use it for herself is one hell of an achievement.
Remember how Rodin was always a secret boss and the hardest fight in the previous two games? Well, he still is the hardest boss fight but the reward is well worth it. His weapon is back and works much like it did in the previous game only faster, and the masquerade ability is simply Malphas’ wings. But the demon slave? Who else but Rodin himself! That’s right, now you have the power of the Infinite One on your side!
Demon Masquerade. Remember Dante’s devil trigger? Well, Bayonetta’s got that with a twist: she fuses with whatever demon is tied to the current weapon she wields. Meaning Bayo pretty much has an entire array of devil triggers!
In a straighter example of a Shout-Out to Kamiya's previous work, halfway through the game Viola gains the ability to transform into a powerful Faerie, immediately after being impaled by Strider. In order to trigger it later, she impales herself with her sword to trigger the same reflexive response from her body. It takes a while to build up, but activating her Faerie Trigger is able to devastate a battle field with ease and run through larger enemies' massive health bars with very little effort.
Now Bayonetta can perform a super attack perfect for clearing the area of Homunculi!
Dead End Express sees Bayonetta become half-witch, half-train and starts running all over the place while warping!
The Ribit Libido BZ55 lets us put on a brief concert for our enemies and the song sung? Only “Tomorrow Is Mine” from the previous game!
The prologue manages to one up the first two in scale. In the first game, we’re wailing on angels in a graveyard before fighting them on midair debris. In the second, Bayo and Jeanne are mowing them down on the backs of fighter jets. This time? Try fighting Homunculi on a cruise ship until a massive tsunami sweeps through the city and Bayo uses the cruise ship as a surfboard!
The Deadly Sin ritual. This ritual involves ripping out your own heart and presenting it while summoning the infernal demon. What this does via the blood that drips from the heart is power up said infernal (or cause the summon to be of its true form) and the results in some way or another are always insane! Perhaps the most awesome thing about the Ritual is that it turns what would be the climactic boss fights of other games into other forms of games, such is the power of these demons that they trivialize what would be huge threats!
Gomorrah becomes Sin Gomorrah. In other words the demonic dragon becomes Godzilla in size! And it turns out he has a gaping mouth on his stomach that can open up for a massive fire attack! And the summoning turns his fight with Arch-Iridescent into a side scroller fight akin to Street Fighter with Tactical Rock–Paper–Scissors in play!
Madama Butterfly is summoned in her true form, the enormous and powerful Queen Butterfly. And her fight sees her lounging in the clouds like she’s luxuriating in a bath and blowing bubbles at her foe, fighting akin to a shoot 'em up game! When she does start trying, it just takes a flick to send the Homunculus flying!
Phantasmaranae transforms into The Phantom! The twister of flame is completely wrapped in fire and is on a timer. Why? Well, when The Phantom loses control, they explode with the force of a nuke! The blast is seen from orbit!
The demon frog Baal is summoned in her true form, the beautiful and deadly Baal Zebul, whose song can slay an entire army and block energy blasts! And she changes what would be a fight against swarms of Perlucidius into a rhythm game!
The final battle involves three Singularity forms, multiple battle locations, and is arguably the most epic in scope in the entire series.
It begins in a ruined New York whose dimension Singularity claims is a world of his design. Bayonetta defeats Singularity's initial battle form, the monstrous and huge Singularity Chaos, via performing the Deadly Sin ritual twice in a row despite the tremendous strain it places on her, leading to Sin Gomorrah and Queen Butterfly working together to blast Singularity right into orbit. There the battle intensifies upon the remains of his Chaos body, Singularity revealing what was hidden within it, Singularity Balance. He declares her struggle is pointless, that the things that have happened are the truth and a reality only he can alter. Bayonetta is not convinced.
With a mighty effort, Bayonetta manages to injure Singularity Balance, in the process not only freeing hundreds of Bayonettas he had absorbed, but also enabling dozens of them to join the fight. That is, at the same time this injury causes Singularity to begin flashing, his image at points turning static, as if his presence in the current dimension has destablized. That the freed Bayonettas are depicted with the same dimension-shifting/destabilized effect as Singularity's current state implies they are actually fighting him from other dimensions, namely that their own worlds were restored along with them. Singularity is incredulous that Bayonetta has somehow "outstripped" his ability to alter reality. What follows is a tremendous battle as all the Bayonettas attack him. Toward the end of this Bayonetta remarks he was clearly not paying attention to what she was doing, namely making the truth what she wanted it to be, and proceeds to free three more bodies and souls from Singularity's body. Singularity is worn down and resorts to cutting himself off from the other dimensions forcibly by striking at each of the Bayonettas, in such a way as to presumably remove the links between the dimensions.
He tries to strike at Arch Eve Origin then, only to be interrupted by Jeanne, one of the three last souls she released. She is not flickering, and thus is truly in this dimension for the time being. The two team up, together managing to destroy the battlefield and knock Singularity back to Earth. Her strength seemingly spent, Jeanne fades away to an uncertain fate.
What proceeds is a reenactment of the opening scene of the game with new context. Singularity and Bayonetta crash back into New York like a pair of glowing green and purple meteors. Bayonetta is exhausted but still able to fight, while Singularity sheds his ruined armor and takes on his most powerful, but also his final and thus vulnerable, form, Definition. The fight proceeds as it did in the opening, Singularity twisting the very landscape to his whims and creating doppelgangers of himself to fight as he wears Bayonetta down. Her Umbran Watch cracks, and so does her body begin to as well. Even Viola's arrival and best effort amounts to nothing as Singularity confidently again asserts that everything is ultimately as he determined.
Then, at the last moment a pair of familiar guns are seen. The newly arrived witch frees both Viola and Arch Eve Origin Bayonetta, and reveals herself to be none other than the Bayonetta from the first game, outfit, mole and single hair ribbon all intact. Singularity tries to attack her, only for his summon to be taken out by Labolas summoned by the Bayonetta from 2. These and Jeanne were the three final absorbed beings Origin had freed. Only now does Singularity grasp the significance of them, as well as the fact they are genuinely here not flickering at all. He knows he destroyed them and their worlds long ago, and realizes that somehow the things he has done are... being undone. The Bayonettas remark that the fact the three of them made it this far, as well as Viola, proves Singularity's reality altering powers are not absolute. The fight continues, culminating in the three Bayonettas temporarily fusing together and attacking with three times the strength. Singularity, despite having seen thousands of worlds, has never seen such a thing.
While the two other Bayonettas eventually fade away (the purple particles implying they are transported back to their home dimensions) and Origin is left winded, Singularity is at last panicking, his body showing clear signs of injury and his actions growing desperate. Viola scores an epic stab with her sword, though she gets trapped in rubble afterwards.
While his arrival is not quite the awesome rescue he intended, Luka does manage to cause enough of a distraction for Bayonetta to get back into the fight. Revealing he can now not only transform at will but command the power of Strider in battle, Luka joins in as the two declare that Viola is the truth they are seeking to protect. Now a Battle Couple, he and Bayonetta flirt and dance about as they tear away at what is left of Singularity's strength. With a final Umbran Climax that shatters her watch, Bayonetta empowers Gomorrah enough to deal a killing blow to Singularity, who proceeds to cause a literal singularity in death, his body bursting apart and manifesting a short-lived black hole in the sky above.
There's something rather awesome in hindsight about how Bayonetta meets her end. After two separate encounters with gods failed to take her down, it takes a guy who seeks out to annihilate the multiverse to rule as its god that hunted down nearly all of her alternate counterparts to put her on death's door. And even then, Bayonetta made certain that it was a Mutual Kill and that Singularity went down first, with it being her Umbral Watch expiring and Gomorrah going berserk once again that led to her end rather than Singularity himself.
Awful as Singularity is, he's some of the most impressive villains seen in a Video Game. Despite not even a god unlike Aesir and Jubileus but an Artificial Human created in a body parts plant, he easily outclasses the actual Gods by blowing up over two thousand universes all by himself and always winning against the incredibly powerful Umbran Witches he's targeting because of his phenomenal affirmation ability — very few video game villains take destruction on this level. Unlike Loptr, he also doesn't fall in a particularly undignified or humiliating way; he can still give Arch-Eve Origin Bayonetta a hard challenge even after being out-rigged, and it's clear she's the only person who even has a chance of stopping him.
