"All Things Can Be Conjoined"
I think this line from Miriel says explicitly something that you can observe about the nature of the universe in Elden Ring in almost every one of it's facets.
I've been thinking for a while about Godrick. He's rightfully seen as insane by pretty much everyone around him- even his own servants, probably his own knights don't actually hold much loyalty towards him. The only people he's managed to conscript in his castle are those too desperate to go anywhere else- the exiled and the banished, and the subjugated stormhawks.
His gruesome art of grafting- his attempt at achieving power and his divine birthright- has left everyone who knows him equal parts appalled and terrified- Godrick perceived as a raving madman claiming divinity that he has no right to.
But as it turns out... Godrick is right!! In Nightreign, we see that he HAS the powers of the crucible- able to manifest a malformed spiraling tail and dozens of horns from his body. His attempts at grafting have succeeded- he has gained access to the crucible through them, connected now to the most primordial form of divinity in Elden ring.
While nightreign isn't strictly canon to ER and vice versa, I do still think that what we see of the world in nightreign can tell us about things in er and give us context for the broader scope of the world via "what-if" scenarios like Godrick awakening the aspects of the crucible.
This is a trend that we see throughout almost all of Elden Ring- that the natural state of things is for them to all mash together and conjoin- that this is indeed the shape of the gods of this world and what their power flows through.
Often, whenever this conjoining happens, it's in the shape of a spiral. Spirals we can think of as generally the shape of divinity, it's natural form- from the sacred Relic Sword, to the spirals of the hornsents incantations to their spiraling horns- and even seen in the godslayers greatsword, a spiral unmaking itself- spirals are generally representative of the gods and religious power in Elden ring.
This spiral can be seen in, as mentioned before the horns of the omen and the hornsent- and the beasts that had those horns forced upon them, conjoining them to the divinity of the crucible- but also in places like Metyr, with her whole body twisting and converging and spiraling in on itself, and Plascidusax- his two heads wrapping around one another in the shape, and the remains of his many others wrapping around his own body. Both of these figures are some of the first godlike figures that this world had ever known- Metyr less a god herself and moreso godly by her connection to the greater will- and Plascidusax as the first Elden Lord before the age of the Erdtree.
Things don't necessarily have to be spirals to be conjoined though- and the hornsent- are again relevant here.
Their attempt to create a perfect vassal, a god, was to meld as many shamans together in their pots as possible- and it's worth asking to what extent they succeeded or could have succeeded. Evidently the act of making pots does grant the powers of those that get melded into them, as we see with Alexander gaining strength after consuming Radahn. One could say this was the primeval form of grafting- maybe more or less refined than what Godrick came to practice.
The Grafted blade greatsword too shows clear power in this conjoinment- all the arms of it's wielders dead comrades coming together to grant the blade legendary power, and it's wielder a conjoined boost to every state in the game- as if all the souls of the blades wielders are granting you their shared power.
The divine dancing lion is also representative of this- although it's more of a stretch.
Even though we know for a fact there are people piloting the suit of the lion, we get no sense that they are actually people with their own independent thoughts or motives any longer. They move in perfect sync, as one body, that of the beast. They are less person now than lion- and I think that at some point they fused with the suit itself, and with one another inside of it. They are not piloting the suit now so much as they are part of it and it is part of them.
Rykard has also achieved great strength in a similar way to how the pots do via the serpent he allowed consume him- devouring warriors and gaining their strength as he did, growing in size. His blade, once pristine and golden, is now a mesh of bodies all jumbled up together from within his digestive.
The frenzied flame melts everything into itself until it is one- it's seal a mesh of all things, and scaling off all stats.
Lastly, the silver/mimic tears- possibly the Nox attempt to create their own god (mostly evidenced by the cut mimic tear questline) is a jumble of pure liquid *stuff* with no substance. Until it finds us, and conjoins- taking on our aspects and making itself into our image.
There are so many ways that this theme intersects into the games many parts- Rot, Storms, Space- so many things tie into this idea of convergence, and I think this a major, foundational part of how the very nature of Elden Rings world and divinity functions. That it naturally wants things to come together and be one on a fundamental level- and that this is often fucking AWFUL for those that actually have to experience it- that this divinity is wrong and undesirable and twisted.
Themes wise, maybe the idea here is that it is the ways in which we diverge- are different from one another- that we should value and cherish in. That things can and should be able to be separated, that individuals may live as individuals and not part of some greater whole or purpose. This indeed is a way of describing what Rannis ending does- separating gods from the world allows people to not be part of the greater converging point that is the order of the world and religion- but to choose what to believe in themselves, and to not have definitive proof of what is right and wrong about the universe to converge on and be forced to dedicate themselves towards.
Melina is the gloam eyed queen.