Not sure why needing a portal to access Ginnungagap matters really, also, asking why Singularity did not outright destroy Ginnungagap and nuke the trinity is ignoring the entire context of his invasion.
It’s specifically said that Singularity has two goals.
• The Destruction of every Universe, to therefore make his native Universe (The Alphaverse) the only one.
In the course of analyzing the Multiverse, he also discovered the existence of a hostile faction bent on erasing all other worlds of the Multiverse but their own. - Midmyers Sigurd
• Gaining the power of the Arch-Eve Origin, who is Bayonetta
And now, to gain the power of Bayonetta, whom he calls “Arch-Eve Origin” and sees as a symbol of the World of Chaos itself, he has begun murdering Bayonettas counterparts on multiple parallel worlds.
So asking why he didn’t just destroy Ginnungagap, and destroy the trinity, shows a fundament lack of knowledge of the basic plot. Destroying the Trinity is not his
goal, it is merely a byproduct of absorbing that much power from the World of Chaos. What’s even more interesting, is that singularity
knows Ginnungagap exists, and he
knows it’s a higher dimensional place. Viola herself says that he uncovered the secrets of the multiverse before anyone else. So the fact that he considers Bayonettas power the main goal, or rather needs to absorb every universe, which subsequently meant he had to effect Ginnungagap, only to be capable of contesting her is very telling.
Also, as my friends mentioned above, this does not affect any other god tier character. This reply will also serve as a response to
That's not my contention. I don't have an issue with saying Singularity is the strongest villain. I just don't know what feats the other villains have, or why they would be Low 1-C.
The trinity of realities was originally one entire universe, but due to an unforeseen conflict, it was split into three. Paradiso, Inferno, and Chaos.
The person who sat at the apex of creation, when all of these realities were one, is Jubileus.
“After the ancient First Armageddon, Jubileus was cast down from the apex of the realms. She landed in Paradiso, controller of the light in the Trinity of Realities, and fell into a deep slumber. Thus began the neverending clash for supremacy between the forces of light and dark; the return of Jubileus would not only unify the Trinity of Realities, but also bring salvation to people who have spent centuries praying for it.”
So, here is our basis. Before Chaos itself was a thing, they all existed as one. Only after they were split, was the realm of Chaos born as we know it today, along with the space of Ginnungagap which encompasses its multiverse.
Of the three realms that were divided at the dawn of time, the realm in-between ― of Chaos ― is controlled by Aesir. With the power of the "Overseer of History", Aesir lived in a dimension completely different from ours, from where he observed endless possibilities that overlapped to form history from a viewpoint beyond all time and space.
Here, Chaos is acknowledged as the entire structure, which means everything that’s ever included in its universe. Ginnungagap, which is called the “
Chaotic rift” is part of this.
Now that I’ve established that Ginnungagap is part of chaos, and that Chaos is part of the original structure, let’s go into the other god tier feats.
After gaining the left eye of the world, a supreme power source, and being resurrected from her slumber, Jubileus is called the supreme ruler of all realities:
Named after the Norse god of light, Balder had a promising future as a Sage, until he broke the tenets of his clan by consorting an Umbran Witch and fathering her child — all part of a scheme to obtain the Eyes of the World, the overseers of history that had previously been split between the clans of light and dark.
After 500 years gathering faith from his followers, Balder's ambitions have reached their climax: Balder, the Last Sage, and Bayonetta, his half-blood witch daughter, are to become the Eyes of the World and herald the Second Coming of Jubileus, supreme ruler of the Realities of Light, Darkness, and Chaos.
As a result of her resurrection, Jubileus was going to merge the Trinity back into a single unified existence. This means that everything which came from its original structure, and everything that currently exists, would be merged back into one. This would mean Ginnungagap too, as an extension of the World of Chaos, that only exists BECAUSE of Jubileus, would be merged.
Kamiya says it here, that when Jubileus was recreating reality, the space you were fighting in, represents the
origin of their universe. Further proof that jubileus created it all. If Ginnungagap is the paper, Jubileus is the textile mill or something idk.
Also why do all the other worlds scale to 5D? Because they’re all balanced with each other. Ginnungagap as an extension of the World of Chaos is included in this balance, especially since it’s a realm within the entire trinity as a whole.
It's a pleasant feeling when everything is in balance.
Our world is also based on such a balance.
The three worlds that make up this world are Light, Darkness, and Chaos. While they overlap with each other, they also balance each other out, and have maintained the structure of the trinity for a long time.
However, these worlds were once one but have split apart, and if any one of them were to have too much power, the equilibrium between them would immediately collapse, causing chaos in all the worlds.
Since these worlds were created they were balanced with one another, possessing equal power. It’s true that Chaos is now weakened in Bayonetta 3, but they were all once balanced.
So to reiterate, Singularity’s goal wasn’t to just destroy the Trinity, but gain the power of Bayonetta, which is regarded as something even more potent than just absorbing Ginnungagap.
Ginnungagap is part of the trinity’s overall structure, specifically the Chaos world.
These three worlds all come from one origin, and the other god tiers had attempted, and are said to be able to merge them back into one.
All realms were once balanced, but now Chaos is considered weaker. Despite this, since they were balanced previously, they are all 5-D.