Expansion for Sidereal Confluence, just requires the base game but works with Bifurcation.

Adds 42 advanced colonies, played during rounds 2-5, that make buying colonies valuable on every round.

Adds cards and rules for real-time bidding(Core Game Not Included).

Sidereal Confluence: Trading and Negotiation in the Elysian Quadrant is a singularly unique trading and negotiation game for 4-9 players. Over the course of the game, each race must trade and negotiate with the rest to acquire the resource cubes necessary to fund their economy and allow it to produce goods for the next turn. Scheming, dealing, and mutually beneficial agreements are key to success. While technically a competitive game, Sidereal Confluence has a cooperative feel during the trading phase as no race has the ability to thrive on its own. Trade well, and you’ll develop technologies and colonize planets to form a civilization that is the envy of the galaxy.