Harry Potter: Hogwarts Battle The forces of evil are threatening to overrun Hogwarts castle in Harry Potter: Hogwarts Battle, a cooperative deck-building game, and it’s up to four students to ensure the safety of the school by defeating villains and consolidating their defenses. In the game, players take on the role of a Hogwarts student: Harry, Ron, Hermione or Neville, each with their own personal deck of cards that’s used to acquire resources.