This is an expansion and requires the base game to play: yes

Play Hero Realms as a Cleric, Fighter, Ranger, Thief, or Wizard! Character Packs add a cool new dimension to player vs player games. Each match-up is a unique challenge which will require different strategies. When playing a cooperative campaign, your Character Pack represents the starting point for your character that you will customize over time.

Each 15-card Character Pack includes:

• A custom ten-card starting deck featuring multiple unique character-specific cards
• A character card with your starting health
• A class-specific minor ability card
• A class-specific major ability card
• Two score cards
• Rules