Earthshaker

Earth Shaker (アースシェイカー) is a Keyblade used by Terra in the prequel Kingdom Hearts Birth by Sleep. Its name and appearance are fitting for Terra, since both have connections to "Earth". The keychain on Earth Shaker appears as a conical rock fragment; this is notable as Terra means "Earth" in Latin.

Ironically, this Keyblade shares its name with one of Simba's abilities in Kingdom Hearts II.

Kingdom Hearts Birth By Sleep
This particular Keyblade appears in the game as Terra's main and default weapon. Recent screenshots and gameplay footage have shown a somewhat redesigned Keyblade with a keychain at the end of the hilt, which resembles a rock fragment. It is revealed that Terra can turn his Keyblade into a bike and ride it to other worlds like a Gummi Ship, though when it does this, it more resembles his Keyblade seen in Kingdom Hearts II Final Mix. It has also revealed that Terra can change his Keyblade into it's massive cannon form, like the Lingering Sentiment could do in Kingdom Hearts II Final Mix.