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

Supernal Venalicium

For: After resolving Trade, the active player draws the alliance ability card of a random, unused faction and reveals it. Then, clockwise, starting with the player to the left of the active player, each player may place their trade goods on their strategy card, but must place more than any other player. If the active player placed the most trade goods, they gain the alliance card and return the trade goods to the supply. Otherwise, the player who placed the most trade goods gains the card, and the active player gains the trade goods placed by that player. Each other player returns the trade goods they placed to their area. Against: Each player removes all units from 1 planet they control, then places 4 neutral infantry on that planet.
Agenda – Law

Law

For: After resolving Trade, the active player draws the alliance ability card of a random, unused faction and reveals it. Then, clockwise, starting with the player to the left of the active player, each player may place their trade goods on their strategy card, but must place more than any other player. If the active player placed the most trade goods, they gain the alliance card and return the trade goods to the supply. Otherwise, the player who placed the most trade goods gains the card, and the active player gains the trade goods placed by that player. Each other player returns the trade goods they placed to their area.

Against: Each player removes all units from 1 planet they control, then places 4 neutral infantry on that planet.

1in the deck
–chance to draw

Source: Black Spectrum – Agenda Pack