Geosprites are a species of sapient crystalline-slime which can take a composite humanoid form when active, absorbing nearby material to create essentials such as functional skin/hide, bones, and organs. Being active constantly drains a Geosprite and pushes it into a state of dormancy if it fails to obtain enough energy to remain fully active. Hibernating Geosprites relinquish all elements not necessary to its dormant form, liquify, and coalesce into an almost impenetrable mass of diamond-like stone which adheres to whichever surface it falls upon within seconds of the transformation. A Geosprite only dies when its Heartstone, a diamond at the center of its core, is penetrated. To either reactivate or remain active, a Geosprite requires constant replenishment from one of the following sources of energy, listed in order from least effective to most effective: radiation, sunlight, and raw magic. The last item however can only effectively be drained when the Geosprite is in full dormancy, and structured spells mostly effect them as normal unless the Geosprite's spell resistance kicks in, in which case it regains 1hp per level of the spell resisted. Note that this spell resistance cannot be lowered and works equally well against healing spells as it does against hostile ones.
Geosprites lack any civilization of their own, being an apparently random by-product of the Fall, but when they are "born" they tend to find the closest sapient civilization and attempt to join it, or at least remain nearby if they are rebuked by its inhabitants. Accepted Geosprites tend to be extremely eager to integrate into their host civilization and will take upon a new identity which tends to stick for the remainder of their life (which has no known natural end). This identity is often built to resemble the dominant species of the host culture with any choice of gender form/role being up to the particular Geosprite's personal taste. This oddly social behavior has led many of the superstitious to believe that Geosprites are lost human souls, and led the paranoid to suspect Geosprites are infiltrators for an as of yet unknown enemy.