The only expansion for Twilight Imperium 2nd 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 2nd Edition - BoardGameGeek