In the subterranean city of Terra, where earth-dwelling creatures and geothermal technology coexist, Gaia, a geokinetic warrior who can control the earth's tectonic plates, joins forces with Umbra, a shadow-walker who can manipulate the very fabric of darkness. Their personalities, one grounded in nature, the other shrouded in mystery, create a compelling dynamic. When an ancient evil threatens to consume their city, their combined powers of earth and shadow become the shield that protects Terra from the abyss.