Arelis, the Plane of Air or the Endless Sky is an elemental plane located in the Inner Sphere. It is the closest plane of existence to the Material Plane. It is a realm of unending skies, clouds, and storms.
This plane of existence, like the others, was created in the beginning when the Great Bard sang everything into existence. It is intended as a barrier between the mortal Material Plane and the Astral Plane.
When the first Ishu ascended, he traveled beyond the stars and found himself in an endless sky where a great storm tried to blow him back to the surface of Astoria. Using his newly gained power, he silenced the storm and became one with the realm he had found. He crafted a crown from the clouds and lightning. He then built a grand palace on top of a powerful storm cloud.