Elemental sprite

Elemental sprites are tiny creatures that live in the Elemental Plane. Elemental creatures exist in many forms. At the lowest level of the elemental hierarchy are the elemental sprites, tiny creatures that exist as a living aspect akin to their element (lightning for the air realm for example). In the hierarchy, they are just below mephits.

Types

 * Flame sprite
 * Stone sprite
 * Frost sprite
 * Spark sprite
 * Lightning sprite

Speculation
It possible that Captured Flames are Flame sprites, Geodes are Stone sprites and Sparks and Spark sprites