AGOT LCG: The Blackwater - Rules of Play says:
The Blackwater is the fifth Chapter Pack in the King's Landing cycle for A Game of Thrones: The Card Game. Your journey to the capital of the seven kingdoms draws you beyond the city walls to explore the surrounding waterways that acted at the setting of the greatest battle in the War of the Five Kings. This battle was the making of many warriors, and you may elevate your own knights to the rank of Kingsguard if you deem them worthy. As shadows continue to creep in from the North, the Reach, and the streets of King's Landing itself, you may find that need more protection than ever if your House is to earn victory and claim the Iron Throne!