"Forbidden Worlds" DLC, aka. "Advent Booster Pack 1"
An interesting side effect of the DLC's 'planetary specialization' system is that the Advent stand to gain a great deal more from it than do the other factions. I say it is so because of the Advent's focus on culture, specifically early available culture, and because of the Advent's inherent weak economy that means they are more reliant on income from population than trade ports and refineries. One of the Advent's disadvantages is a lack of economic upgrades through research, of which both the TEC and the Vasari have more. Now, with the DLC, all planets have many more available economic upgrades, none of which require research. These things combine to mean the Advent player can develop much more rapidly than was possible before. The best example case of this is the homeworld itself. As soon as the game begins, without having even built a single lab, one can start growing the population base of the homeworld. This is possible for every faction, but it is stronger for Advent because they can start spreading culture both earlier and faster. With social specialization upgrades, the high-allegiance, near-homeworld planets can develop significantly higher population bases, faster. The Advent then soon applies an impressive empire-wide 10% bonus to this entire, larger-than-normal economy through an inexpensive researched tech and single building. The further consequence of the availability of these specialization upgrades, which create a new, alternative way to grow one's economy, is that the need for trade ports and refineries is reduced, effectively postponing the time when the Advent will suffer from a lack of upgrades much further into the late game.