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

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Neural Parasite (Obsidian)

At the start of your turn, destroy 1 of another player's infantry in or adjacent to a system that contains your infantry. This technology cannot be researched.
The ObsidianTechnology – Biotic

Biotic

At the start of your turn, destroy 1 of another player's infantry in or adjacent to a system that contains your infantry.

This technology cannot be researched.

Source: Thunder's Edge