Heroes of the Storm is a crossover multiplayer online battle arena video game developed and published by Blizzard Entertainment. Announced at BlizzCon 2010, it was released on June 2, 2015 for macOS and Windows. The game features various characters from Blizzard's franchises as playable heroes, as well as different battlegrounds based on Warcraft, Diablo, StarCraft, and Overwatch universes.