The most in-depth video on Mount Celestia there is.
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Timestamps:
0:00 Intro
1:40 A Brief History of Alignment
5:03 Law and Good
8:19 An Overview of Mount Celestia
12:54 The Paths
14:54 Archons
25:05 The Celestial Hebdomad
29:10 Aasimon
34:08 The Order of the Planes-Militant
36:10 Magic on Mount Celestia
38:33 How to Get There
41:35 Excelsior
45:49 Lunia, the Silver Heaven
53:56 Mercuria, the Golden Heaven
59:07 Venya, the Pearly Heaven
1:01:51 Solania, the Electrum Heaven
1:08:51 Mertion, the Platinum Heaven
1:14:01 Jovar, the Glittering Heaven
1:15:34 Chronias, the Illuminated Heaven
1:16:20 End
Sources:
D&D Volume 1: Men and Magic (1974)
D&D Basic Rules Set (1977)
D&D: Basic Rulebook 4th Edition (1981)
AD&D 2e Player’s Handbook (1989)
Planescape Campaign Setting (1994)
Planescape Monstrous Compendium 1 (1994)
Planescape Monstrous Compendium 2 (1995)
The Planes of Law (1995)
Player’s Primer to the Outlands (1995)
On Hallowed Ground (1996)
Powers and Pantheons (1997)
Sea of Fallen Stars (1999)
Warriors of Heaven (1999)
Guide to Hell (1999)
D&D 3.5 Book of Vile Darkness (2002)
D&D 3.5e Player’s Handbook (2003)
Book of Exalted Deeds (2003)
Serpent Kingdoms (2004)
Player’s Guide to Faerun (2006)
Monster Manual IV (2006)
Tome of Magic (2006)
D&D 4th edition Player’s Handbook (2008)
5e Monster Manual (2014)
D&D 5th Edition Player’s Handbook (2014)
Fizban's Treasury of Dragons (2021)
Sigil and the Outlands (2023)