“The quantum properties of the unproton meant it only half-existed. The periodic table doubled, as ”.5" could be added to each atomic number.
Element #47.5: Sequestrium (Pq)
The original mirror, this metal naturally forms portals to a backward universe that is oddly vampire-free.
Element #79.5: Doradium (Do)
This soft, yellow metal blocks out telepathy. Paranoid kings wore crowns of it, or bluffed using mere gold.
Element #86.5 Treachery (Ty)
This gas is dangerously radioactive, but only in parallel realities. A staple of interdimensional warfare.“