So, this is a theory that i'v been tossing back and forth in my head for a few weeks now, ever since we learned more about Aurene's nature as an Elder Dragon, specifically the Elder Dragon of Fury and Light, or a 'Prismatic' Dragon as Gorrik put it. This is by taking the individual parts of the different kinds of magic and combining them in a way that acts like a Prism, Prisms themselves typically associated with the channeling of light into the environment around them. However merely changing and recombining magic in different and interesting ways would not be enough to do the sort of things she is like 'purifying' the Brand, what about her magic allows her to alter the Brand in such extreme ways? Surely it can't be as simple as just taking the base elements of the Brand and forcing them to do something completely different. This purification process seems to be both stop corruption, and at least on a casual glance actively enhance the plant life around it, it's quite mysterious.
This got me to thinking of an equally mysterious kind of magic, one that shares many thematic similarities, has a lot of lore to it, and yet very little about it's actual nature is explained: Guardian Magic.
The magic of guardians has a long and storied history that for the most part draws into humanity. A combination of Monks meditations, Ritualist ancestor magic, and Paragon command training it only relatively recently spread to the other races as it all coalesced into the modern day Guardians. What we have been able to discern is that this magic draws from something called the 'Light' which appears to be a reflection of a set group of virtues focused on self improvement. In many ways Guardians are the anti-Mesmer, where Mesmers focus on the manipulation of those around them to do what they want them to do, the Guardian focuses on refining the self into a paragon who has absolute control of themselves. Philosophically speaking it shares a lot in common with Greek Stoicism, especially when it comes to Firebrand. The Cardinal Virtues of the Stoics are almost the exact same as those of the Guardians if you take 'Fortitude' to mean 'Resolve', with a lot of emphasis on the power of wisdom and behaving in a righteous morally upright fashion.
For the magic itself while we don't know it's exact origins we can guess based on some things. It's chiefly fueled by faith to the point it has skills themed after holiness and consecration, whether that be faith in the gods or faith in ones friends, and that imbues the person with a righteous fervor that constantly drives them to purging corrupting influence both from oneself and from the world around them. Preservation and protection is a big theme in guardians as their abilities often revolve not only around purging the wicked but ensuring their allies are sheltered from injury. Self sacrifice is a common thread with all the virtues,a good guardian knows when to sacrifice their own beneficial magics in order to defend their allies, mend their wounds, or empower their weapons to strike their enemies. Life as an abstract concept is also very important, of all the classes these are the closest to a dedicated support and healer, ensuring that the wounds of their allies are always on the mend.
Now I have been fascinated with Guardians for the better part of a year, don't let the Mirage avatar fool you(I happen to also really like Mesmers and Lyssa.) because it matches a lot of paladin-esque virtues. Not that long ago I got really into playing my Firebrand and went through the Living World, I started to notice certain things. The biggest of these is that thematically speaking, my Guardian more then any other character I had best complimented Aurene thematically. Aurene as a character is very much about bringing hope to the hopeless in the same way that Guardians inspire those around her, she also draws people to her from all orientations and walks of life in many ways that Guardians are often thought of as battlefield commanders. At the same time she is protective and empathetic of her charges, largely acting in a benevolent fashion to ensure their safety and healing. Looking over the Brand in Grothmar valley she is definitely driven by some invisible need to purge corruption and even convert it into something beneficial in the same way Guardians convert conditions into boons, as well as bring life to the world around her in a way that isn't strictly nature magic but more tied to life itself as abstract concept.
As superficial as this sounds the color palettes when it comes to magic in guild wars are also important. Dwayna the Goddess of life is typically tied to the color blue or white, as well as concepts of light, lightning, and air. She's also depicted as the leader of the gods curiously enough despite neither being the oldest nor perhaps even the mightiest. Guardians also have blue and white as their primary colors with a lot of that magic focused on the elements of air(Breaths.) and water as life giving energies, as well as purging flames to wipe away corruption that often take on blue coloration. Aurene as a dragon typically is tied to the colors blue and white, with many of brands looking like they have taken on a pastel hue, being a dragon she's of course fond of fire as well but also has a lot of ties to lightning just due to to the Brands originally being charged by lightning bolts and using that same lightning to direct Branded minions from place to place, thematically all these things are really close to one another. If that's not enough for you also consider the Skyscales we've recently hatched, over the course of them we've learned about several different types of magic, among them courage and life, both of these magics share a similar color palette as well.
My theory is that much as the Bloodstones were split into different types of magic like preservation and destruction, the Dragons too have specific realms that were originally important to naturally balancing the world in a similar way. I'm going to go out on a limb here and say that Guardian magic may of been the Keystone that linked the other Bloodstones together, an abstract form of magic born of our primal virtues and inner selves that could just be defined as 'Creation' in general. Much like that Kralk was this Dragon of 'Creation' or preservation, or just 'Light' if you want to call it that and he served as the keystone that kept the other magics together, a natural balanacer of sorts. But all this magic flowing through him over time inevitably drove him insane, and perhaps even triggered the corruption of himself and the other Dragons. Now Aurene as a new 'Prismatic Dragon' has a chance to, with the aid of native Tyrians, help the planet in a way her forebears could not.
Phew, okay that is my wild outlandish theory. It pulls on a bunch of different things, but I think it kind of all fits together, what do you think?