Do I have to do everything here?
The time period - immediately before the Ascension wars.
The hero - a disgruntled man who has an axe to grind with the Supreme Deity.
The setting - the hollowed mountain, capped by a tower, in which the One resides.
The enemies - the guards, worshippers, and piligrims from all seventeen races.
The vaults - trophies room from His ascension.
The special levels - single race levels, path themes, well known players.
The end boss - one of the pretenders of the original Dominion
The easter eggs - too many possibilities to mention
Steal, I mean borrow the code from ADOM, and Bob's your uncle.