Immarius invades planet Earth in search for the Chaos Emeralds.

He has a blue flame on his chest which provides him life. He wears a full covered black armor and wields a large katana which can transform into various weapons. Immarius is a strange organism from Elvenstar and the leader of the Gravitus army. They are also categorized as Starter characters, Unlockable Characters and Non Playable Characters. Each character is categorized based on their Type. The game contains 25 playable characters, each one with their own unique abilities. Head here to see the game's detailed storyline. Main Article: The Chronicles of Sonic the Hedgehog: Rise of the Heroes/Story Who are these mysterious invaders and what are their intentions? Is the crash of the comet connected with their arrival? It is now up to Sonic and his friends, old and new, to unite and defeat these invaders and save the world from certain destruction once again. After a comet crash lands on Earth, a mysterious alien force from outer space threatens to destroy our world.

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