Twilight's Fall – a separate game. Twilight Imperium's expansions, mods and rules topics are not part of it.

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Singularity Z

Once per combat, after 1 of your opponent's units is destroyed: You may place the "Singularity Z" token on one of your opponent's abilities. While that token is on a card, this card gains that card's text. You cannot place a singularity token on a card that already has a singularity token.
Nekro Virus originAbility – Biotic

Biotic

Once per combat, after 1 of your opponent's units is destroyed:

You may place the "Singularity Z" token on one of your opponent's abilities. While that token is on a card, this card gains that card's text. You cannot place a singularity token on a card that already has a singularity token.

1in the deck
–chance to draw

Source: Twilight's Fall