The Medarda Family and the True Goal of Shimmer
Nature has made us intolerant to change, but fortunately, we have the capacity to change our nature. -Singed
For most of s1 the only versions of magic the audience really gets familiar with are visualized through hextech blue and shimmer pink, but we can't trust it to represent what actual magic is like on Runeterra. People from PnZ are incredibly unfamiliar with magic, it was banned for centuries, and they're mostly retracing steps and doing guess work. The best metric to understand how magic works is to look at characters and regions that are actually inclined to magic, and the Medardas may be the best example yet.
When Ambessa accepts the Wolf totem from Lamb one half of dual aspects of death, her body is enveloped in a bright purple transformation before being reforged into a red that resembles the kind her ancestors and the Lamb wear.
It's the same bright purple that consumes Sky in Viktor's last experiment with the hexcore in s1.
I think this purple represents magic at its most malleable state, where it can be refined or change others into final products with a proper catalysts. By s1's final scene, we know that Mel possesses magic and likely uses it through her golden armor. We also know it's possible for magic to be a hereditary trait that can be passed down (not perfectly) through family lines, which is prized in Noxus (and Ixtal?).
So if Mel has magic that likely means the Medardas family in general has latent magic that flows through them naturally., but qhat does this have to do with shimmer or PnZ in general?
The Medardas are relevant to PnZ because Zaun leading minds, Silco and Singed, have spent their capital trying to replicate what the Medardas can do!Shimmer doesn't exist purely as a bioweapon, that's frankly secondary to it's point. Shimmer exists as a means to artificially make the users capable of performing magic, or at least shift the user's biology into something that can tolerate magic. Hextech as a solution to the mystery of maguc completely sidesteps the relationship between magic and the user by using machinery as middleman, while shimmer takes a more direct route.
Singed can't literally biohack nonmagical people into mages all by himself. Singed instead developed what's essentially a hormone therapy to give users temporary magic abilities by synthesizing shimmer from these mysterious plants that resembles the color of the magic within Ambessa before her deal with the Lamb.
Why didn't Singed and Silco just give people the magic purple plants directly if it's capable turning them into mages? Sky and Rio might be the best examples for why you don't do that. When young Viktor feeds Rio the purple plants we see Rio immediately lose vigor, as an audience most of us assumed that was simply Rio's pre-existing condition acting up, but the relationship is more simple. When Singed said Rio was dying, he said it with surety because Singed KNEW the exposure to magic was killing Rio. And Sky was DISINTEGRATED upon being exposed to the hexcore's magic.
The wild thing is that all this effort is to get non-mage users to Ambessa's UNREALISED state, the purple is just the base magic that exists in mages. Even still, Singed seems to have developed the kind of strain of shimmer that's the closest he's ever come to real magic, and Viktor and Jinx used it.
Viktor's own magical transformation has been facilitated by the hexcore in the same way the Lamb facilitated Ambessa's transformation. Do i think Viktor has essentially created his own Aspect through the hexcore? NO.
But in the same way shimmer is facsimilie of magical ability, so too is the hexcore a subsitute for living magic. And by living magic I don't mean unicorns or mermaids, I mean magic that is given consciousness and shape by being tethered to human concepts. And the hexcore's basic purpose is supposed to be magic that thinks and Viktor has tethered it to the human plane with his blood.
This all begs the question about what could exposure to the hexcore do to long term shimmer users? What WILL it do to Jinx? We all know that's inevitable next season.
You see, power, real power doesn't come to those who were born strongest or fastest or smartest. No. It comes to those who will do anything to achieve it. -Silco
Tldr: Shimmer is a large-scale project to turn the population of Zaun into mages, or magically tolerant, by essentially microdosing the population with magic through shimmer.