Kasta

The planet Kasta is the oddball planet of the bunch, with a strange orbit and a stranger surface. There are remnants of an ancient civilisation, unlike any other, and there is much ancient technology all over the planet that even now, ten years after its initial exploration, we have absolutely no idea what it does. However, Ender has, in his adventures, found out that one of the technologies, a large glass pyramid, is a kind of space-time warper, using the entire planet as a giant battery for absorbing the power of a Total Alignment from Espira, and powering up the Void Walker from its dormant state.