Premise: Pillars of Eternity: The White March is a two-part expansion pack for the 2015 role-playing video game "Pillars of Eternity", developed by Obsidian Entertainment and published by Paradox Interactive. The first part was released on August 25, 2015, while the second was released on February 16, 2016.
Hypothesis: Pillars of Eternity is a two-part expansion pack that was successful.