Gate-town: Excelsior. Its streets are paved with gold-flecked brick. The town is kept safe by the floating castles of the paladin lords that surround the perimeter. The gate: it's somewhere on the top of the tallest tower of the city, from where it is possible to see the towns of Tradegate and Fortitude.

Mount Celestia embodies the idea of ultimate lawful goodness. The mountain is home to many creatures of good, such as shedu, noctrals, lammasu and all types of aasimon. The primary residents, the archons, are to Mount Celestia what the baatezu are to Baator or the tanar'ri are to the Abyss.

The only way to reach Mount Celestia is by entering from the Silver Sea that surrounds the lowest layer, Lunia. Many portals, gates or conduits ever lead on the plane directly over the Silver Sea. Creatures called zoveri aid travelers who have fallen into the water and keep them from drowning.

Mount Celestia's seven layers ascend, one atop another, in the form of a mountain that rises from the immense silvery sea. Only by climbing the mountain a body can attain the next level. Each layer has a path leading up to the next layer, but the path can be found only by those who have been enlightened and have found some truth regarding law and goodness. As a body climb to the top, she becomes more pure until she reaches the pinnacle, where she becomes a perfect being in accordance with the plane's alignment.

The palace of Bahamut, the power of the good dragons, is the best short-cut for planewalkers who just want to conduct some business here and be on their way.