The Spirit of the Earth
Gaia is the consciousness and spirit of the prime material plane itself and protects Midgard and its parallel planes from direct interference by the deities or the primordials. Gaia is formed of the collective consciousness and spirit essence of all living things creating a single being composed on many parts. Gaia is much more powerful than any single deity or primordial and uses that power to prevent most direct interference with the mortal plane by the higher powers forcing them to do most work through intermediaries. Druids, shamans, wardens, and barbarians channel the spirits of Gaia to gain their power.