Greater elementals are beings that embody massive elemental bodies.

Echirim (varies) - embody continents
Epochal (time) - embody time periods
Great Ern (nature) - embody natural forces and changes
Hariqana (fire) - embody great fires, volcanoes, and magma
Ikhaenin (wind) - embody sky and atmosphere
Khardantal'has (earth) - embody the subterranean layers and mountains
Logos (star) - embody stars
Nephesh (creation) - embody planets and moons
Shadow-kin (darkness) - embody all darkness, from the depths of the world to the vastness of space
Terra Anima (varies) - embody landforms (forests, swamps, tundras, plains, etc.)
Yllorien (water) - embody oceans