Celestia
Celestia, also called Mount Celestia or the Seven Heavens, is the plane of lawful good alignment, home of the archons. The single sacred mountain of Celestia rises from an infinite sea of holy water to incomprehensible heights. Here, justice, kindness, order, celestial grace, and mercy are the rules. Here, watchful eyes hold the ramparts against evil in all its many forms. Here, all things are beautiful. Its seven layers are joined in such a manner that traveling deeper into the plane becomes an ascending journey, up mountain after mountain. Each layer glows with its own color of soft light and each was unique in terrain. The Seven Heavens are also the home of Myranthus, the Dawnsinger, who resides in his realm, the Dawnbreak Bastion.
The Seven Heavens are dedicated to goodness shaped by law and justice tempered with mercy. All aspects of Celestia are beautiful and perfect; it is where the souls of many creatures of lawful good alignment go to after death. Celestia is home to numerous celestial creatures including various types of archons, the petitioners of this plane.
The Seven Mounting Heavens are the planar home for mortal souls of kindness and empathy for their fellow creatures. Mount Celestia is a promise of betterment and ultimate union with the powers of good and law for those worthy. So supplicants of every snipe ascend the layers, one after the other, to the ultimate height of the Heavenly City, and from thence into the Illuminated Heaven.
As an outer plane, Celestia is spatially infinite and consisted of seven infinite layers (or sub-planes). The seven individual layers form a colossal mountain that rise from an infinite sea of holy water on the bottommost layer, to the summit on the topmost layer.
The only way to reach Celestia is by entering its first and lowest layer, Lunia, also called the Silver Sea. Visitors always find themselves in the surf of an ocean surrounding Mount Celestia. Very few portals from other planes lead anywhere on Celestia other than to the Silver Sea. Ascending the mountain is analogous to traveling through subsequently higher layers to the top. Each of the seven layers contains at least one mountain or high structure rising into the sky, and most have whole mountain ranges.
The barriers between the seven layers are arranged such that entrances are at the lowest geographical points and exits are at the highest. From the seashore at the bottom of the first layer to the heights of the seventh, paths wind up the many peaks, ridges, canyons, and passes of Mount Celestia. Somehow, every incline looks up to the next layer, which shines like the sun on the layer below. Each rift eventually leads down past arching waterfalls and rushing brooks to the Silver Sea. Even from many layers above, the ringing chimes of each wave breaking on the shore of Lunia are faintly, reassuringly audible. The sky of each layer has its own hue which softly bathes everything in gentle shades of luminance.
But what makes ascending Mount Celestia more than just a matter of climbing is that each layer has many paths leading to the next layer. Only those who have found some truth regarding law and goodness can find the path. Thus, attaining the pinnacle involves a series of trials during which the supplicant is slowly washed of ideals that do not conform to the plane. However, there are rumored to be nonspiritual shortcuts for the traveler who knows where to look or whom to talk to.
Celestia is home to many creatures of good, such as aasimars, devas, planetars, and solars. In addition, several groups of good-aligned natives of the Material Plane have set up residence on the lowest slope, along the beach of the Silver Sea.
The archons are the native and most numerous inhabitants of the Seven Heavens, cheerfully going about the business of serving the Higher Powers. Archons come in many types; most common are lantern archons, hound archons, and trumpet archons. Human and non-human pilgrims, shedu, lammasu, ki-rin, and dragon horses, visit fairly often. Collectively, the inhabitants of Celestia are called "Celestians". The spirits of those who earned a place in the Seven Heavens would become lantern archons much the same as evil souls became larvae in the Lower Planes.