Would "Opponent gains 3 quanta of his or her Mark."fit? The symbol would just be confusing....
I like the idea, but wouldn't it fit light better? Not sure other is the best fit... And then you could really have light darkness duos.
Would rain of fire, etc, remove this ability?
All the cards are intentionally other to represent it being a Pseudo-Element.
"Opponent gains 3 quanta of his or her mark." may fit on some cards (like this one), but it normally will not on most of the Void cards since they all have their own effects. To be consistent it's better that a quantum symbol is used.
AoE CC like RoF would remove this, but that would be counterproductive since you'd be using your own AoE CC to disable your own permanent.
Thanks for clearing it up, the link for the series didn't work for me (messed up forums...).
Maybe just give them an ability, "Void" and just like its with Chargers (momentum) it's not explained there, but everyone would know what they mean. Just an idea, because the extra mark is still confusing.
My idea of RoF was just because it removes invisibility, and whether you don't see your opponent or yourself, it's still invisibility. How about Pandemonuim then? Or Unstable Gas? (just ideas, when you'd affect your creatures as well.