Allies is the fourteenth expansion to Dominion. It has 400 cards, with 31 new Kingdom card piles. There are Allies, that will do Favors for you, and split piles you can rotate. Dominion: Allies is an expansion and cannot be played by itself; you need the Basic cards and rule book (the Dominion base game provides both). Dominion: Allies can also be combined with any other Dominion expansions you have.