There are trillions of beings, living throughout the universe. Surely some of them would have done something like this before?
Well, the Malthusians did, before their split into focused factions. Their symbiotes gave them the same kind of boost that has been gifted here, and with them they forged a legacy that encompasses the entire universe.
But the fact of the matter is that there are many things that have to go just right, for something like this to be possible. Earth is a magic-rich world, located at the center of the universe. There is, here, a focus. Made not just with gems, but also with symbols, and symbolism, and feeling. By a human — a species that has had its soul saturated in the magic of the Dream. By someone boosted to the peak level of human ability at focusing and directing each of the seven primal emotions of the universe. By someone who uses an incantation, felt from the heart and touching each aspect. By someone who knows in their heart what to expect, and is focusing the outcome toward that.
So it should not be surprising, really, that such a rare thing could occur.
A wave of pure Life radiates out, passing through the walls of the building as though mere matter is insubstantial in the face of this.
It is not, perhaps, what they might have hoped for. The bracelet is unable to retain more than the barest impression of rushing white light. It certainly does not end up as a functional ring-equivalent. But ...
When the light has died down, they feel strangely empty and emotionally exhausted. Everyone within about ten meters, themselves included, is Healed. Wonder Woman notices her slight backache disappearing. Down a floor, in the Justice League infirmary, a young boy in a white solar suit suddenly straightens up. A passer-by in the street stops and pauses to look around the world in wonder, no longer color-blind.
And here in the meeting room, the visitor, the light-weaver, sits in ... not their ideal form, for that is more of a process than a state, but in a form that suits all of them much better than the one they had a moment ago.
And they no longer remember any details about the Anti-Life equation, other than that it is a dangerous lie that exists.
Sometimes, the greatest things can be achieved with just a bit of outside perspective.