Alllright long time no see for the thing that actually made the DragonScape so lets talk about The Steiron in as detailed a view as I can afford to give!
Can't have billions of dragon gods flood into our reality for no reason what soever after all, its the closest this setting has to a McGuffin that about noone knows exists, and really noone truly understands until the very end of its existence.

First lets go back to the one that weaves the blanket

There are things higher than the Raddir, higher than any god and, the way I refer to it outside of canon is as "It that weaves the blanket" or "the one that weaves the blanket". Whatever it is and/or is not, it is the entity/entities that make realities, the infinity of realities that ideally never actually clash or merge or nothing of the sort. and it is this entity that makes and places the Steiron. As for our reality The Steiron is a keystone that keeps the other realities nearby from flooding into our own, it's a sink plug in a way of thinking, it seals realities and separates them.

In the case of our reality it is a humble stone, modest really and rather unassuming. For one reason or another it wound up onto our planet and over billions of years of gradual tectonic processes would wind up where it is in 2020 when a Brazilian mining operation would incidentally damage it, causing The Pulse and the creation of the DragonScape in it's entirety.

It is also a massive rock, standing at 18 meters tall and about 8 meters in width, its an imperfect butte of a rock made up of a dull red material, the qualities of which are like stone, but of no specific stone. Prior to its breaking it most certainly would have appeared benign, perhaps the only sign of potential supernaturalness about it being the resonance emenating from it, enough to give someone near it an understandable unease.

But after it was broken

It has become a font, spilling forth Õndemic reality into our own, initially resulting in the Pulse and creating a Õndemic wave pushing through space and reality well past the speed of light. It is from the Steiron that the endless spiral of Õndemic reality flows and, it was its breakage that caused The Pulse to begin with and the consequent DragonScape

Since then It has remained, broken no further and rarely touched as, ontop of other things it is a death sentence to approach even if not for violent reasons.
Coming within 30 meters of The steiron's location will bring people into something of a different space of a barren landscape, wracked by the unfiltered resonance of the Raddir that will likely result in the death of any living creature or spirit by resonant dissipation, or by starvation, dehydration, etc. due to being trapped in the space

Though this would change in the Human Thalmvaric war

In which a united alliance of draconic states would seek to 'set right the balance between monster and drake' by breaking the Steiron entirely, fully consuming what what remained of "human reality" with that of Õndemic space and reality. To this end a sacrifice was made in the form of a team of dragons who faced their own outright annihilation (no afterlife for those who die near the steiron) who ensured the steiron would be truly shattered once and for all. This second break and crumbling would cause Õndemic reality to flood reality and a centuries long apocalyptic war between the remnants of the reality that was against dragonkind that would be known as the Human-Thalmvaric war.

or, more generally, as What Wrought the Ongoing, a war so apocalyptic that it led to the death hundreds of billions of creatures across the universe, the collapse and scouring of draconic society across the planar, and the extinction of the last of the reality that was, humanity included.
And from that point onward, the Steiron was no more and two realities were forever joined, one swallowing the other.

But back to the Steiron in the Awakening period

Particularly Who knows about it?

Which namely, is just about noone. There are only a handful of people in the DragonScape who even know of it's existence, and I mean about 4 people during the Awakening Period. Those being what was left of the miners who originally broke the rock. Even then they most certainly don't understand what the Steiron even is, just that they broke it and it probably created all the problems they face today.

So we can get into the Guardiões da Mina

who also refer to themselves as the Rencaões are the society built closest to The Steiron and have a lot of indirect feelings about it.
The Rencaõ chiefdom lives amongst the hostile saltmarshes of Renca and, over the decades have built up a surprisingly successful urban society from these marshes and, by the time of Imuas arrival, would be a growing regional and military power. This society would start off led by those 4 aforementioned miners and was mostly constructed off of one major goal (at least on their part)

being: PLEASE GOD DON'T LET ANYONE ELSE GET NEAR THIS GOD DAMN THING

While the city isn't really that near to the Steiron, most of the drekir there understand the supernatural properties of it and, the 4 miners included, see it to some extent as a holy land, a sacred space beyond space and time that is theirs to protect. It's not just a pragmatic duty, its a religious and cultural one.
This has lead the Rencaões to become a highly militaristic society, but also one hellbent on manatechnological experimentation to better make their land liveable and to better protect what they see as the thing to protect at all costs, which would lead to them becoming the dominant power of Southeastern (what was Northeastern) South America, becoming one of the earliest empires in DS history as early as the 5th century PA
Though on the long run this region like so many others would face maaaany societal shifts, collapses and reconstructions, dark ages and golden ages, and ironically 20 thousand years later, it would be the long descendent peoples of the Guardiões who were known to devote themselves to defending the steiron this who would crumble the steiron once and for all

So yeah

The Steiron, lore as old as the setting itself and the thing that broke, which then broke reality. Drew it last about... 5 years ago? yeah 5 years ago, man crazy!