Celestia was the epitome of law and good. All aspects of Celestia were beautiful and perfect; it was where souls deemed worthy and collected from limbo are taken. Celestia was home to numerous celestial creatures including various types of archons, and the Seraphim.
Celestia was spatially finite and consisted of glittering mountains and cities filled with angelic beings, built along the edge of a single mountain peak. Travelling down the mountain leads to the fruitful planes, forests and seas of Avalon. Travelling up the mountain leads to the Throne of Eo. The sky of Celestia is brilliant daylight but sparkles with the radiance similar to the night sky of the Material plane.