Ends of the Earth

The Gaia Bane (ガイアベイン) is a Keychain for Terra's Keyblade that is found in Kingdom Hearts II Final Mix and Kingdom Hearts Birth by Sleep. Like Terra's other Keyblades, it is able to shift into multiple forms, including a whip, a jet-vehicle, a spinning-cog weapon, a cannon, and a gigantic Keyblade.

In Kingdom Hearts Birth by Sleep, Terra's Keyblade develops this form after he chooses Riku to inherit the Keyblade. Terra's Keyblade permanently takes this form once his body is stolen by Master Xehanort, and his armor becomes the Lingering Sentiment. The Lingering Sentiment continues to use this Keyblade, even when it attacks Sora in Kingdom Hearts II Final Mix.

Design
In Kingdom Hearts Birth by Sleep, the Gaia Bane retains its Keychain, but in Kingdom Hearts II Final Mix, it has been removed. The design for the Keychain had not been made when Kingdom Hearts Birth by Sleep was still in development, which led to speculation that the Keyblade may have been a fake.

Terra's Keyblade Ride bears extreme similarities to the Gaia Bane's design.