The only expansion for Twilight Imperium: Second Edition introduces two new races—the Yssaril Tribes and the Mentak Coalition—and adds shock troops and race leaders, new Political and Action Cards, Deed Cards for tracking income and influence, and new map board tiles including a nebula and a "gravity rift". Shock troops are elite ground forces, and some specifics are tied into Hope's End, a new planet in the map tiles. Each race has three "race leaders" which are of 5 different types; each adds different abilities to troops, planets, or systems. The "gravity rift" map tile will send ships that enter it in a random direction when they exit. Part of the Twilight Imperium Series. Expands: Twilight Imperium: Second Edition