Hero Realms is a fantasy-themed deck-building game where players take on the roles of powerful champions. Each player starts with a unique deck of cards and aims to reduce their opponent's health to zero by using various abilities, summoning allies, and casting spells. The game features a variety of character classes, such as Warrior, Thief, and Wizard, each offering different strategies and playstyles. Players can acquire new cards from a central market, enhancing their decks as the game progresses. Hero Realms can be played competitively or cooperatively, making it versatile for different gaming preferences.