The Geomancer is a position of power given by Mother Nature to only one human at a time to defend the Earth. When a Geomancer dies, the Earth will choose a new successor. Gilad the Eternal Warrior is the "Fist and Steel" of the Geomancers and he has protected them for most of his/her immortal life.
Uncle to Geoff who was lossed in the time stream. Clay McHenry was a blind retired police officer who gained the Geomancer ability to use the energy to commune with earth to help protect the planet.