7 Wonders - Leaders adds 36 new cards to the base game of 7 Wonders.
Three new guilds and 32 new, white "Leader" cards.
At the start of the game, each player takes a hand of four leaders and may play one at the start of each of the three Ages. Unlike the standard cards, leaders cost money (not resources). The expansion also comes with a new Wonder - the ancient city of Rome - and tokens for more efficient money-management.
For more information, including rules translations, visit BoardGameGeek.