The article is speculating on the possibility that a fourth COVID vaccine shot could “last forever,” hence the concept of “one Covid shot to rule them all.”
But... the literary reference in this case is to the One Ring of Sauron.
For those who may not be aware: In J.R.R. Tolkein’s epic trilogy The Lord of the Rings, the One Ring is the evil ring forged by the evil dark lord of Middle-earth, Sauron.
It was meant to be used to enslave the entire population of that world.
Bloomberg business obviously has illiterates running their Twitter account or they’d know the One Ring was pure evil.