Astral

The Astral Plane is the plane that the God Hand and elemental lords reside. Schierke visits the Astral Plane and asks the Elements for help several times in the manga, the most noticeable ones being the Troll arc where she calls upon the 4 elements, Land, Fire, Sky and Sea to erect a barrier against the Trolls. Unfortunately it only works against astral creatures, and when the Ogre arrives, it is useless against the roof beams that it throws through the Church.

Other times Schierke has visited the Astral Plane is at the end of the Troll arc where she makes a pact with the God of the Rotting Roots to rot all of the Trolls.

Another time was at the docks at Vritanis where she calls upon the help of the Blaze Wheel to burn a large amount of the Daka

Deeper in Astral plane is where it is believed that the God Hand reside and deeper yet is the strange Idea of Evil, but no magic user has ever dived that deep and survived.