Avernus	Dis	Minauros	Phlegethos	Stygia
Malbolge	Maladomini	Caina	Nessus	-
Hell	-	-	-	Manual of the Planes

Avernus is the topmost layer of the Nine Hells,
often referred to in devilish circles as "the front parlor."
Its sky is a dark red and starless.
It is a rocky wasteland; <dmg=badlands>
the few plants are stunted && twisted.
The atmosphere of Avernus is filled with flammable vapor gathered into innumerable glowing spheres that radiate a {dim} {light}.
There is a 1 in 6 chance per TURN that a glowing region bursts into a fireball (as the spell) for 2-7 d6s of damage.
(This is reduced to a 1 in 12 chance per TURN in the traveler refrains from using open flame--torches, candles, etc.)
Many of the devils within this layer are out of favor deeper in the Hells,
but not in so much trouble that they must flee to Gehenna || Hades.
Some of the great rocky crags of this layer are actually secret shelters for greater devils who are astrally projecting.
The watchdog of the Hells' front parlor is Tiamat.

The Realms of Avernus

The Realm of Set

The Realm of Kurtulmak

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Frequency of Devils on Avernus (The 1st Hell)

Ruler = Tiamat	Abishai = C	Arch = VVR	Barbed = R	Bearded = 0	Bone = 0	Erinyes = C	Horned = 0
Ice = 0	Nupperibo = U	Fiend = 0 <alt>	Spined = C	Styx = 0	Achaierai = R	Barghest = VR	Daemon = VR
Hell Cat = 0	Hell Hound = VR	Hoardling = VR	Imp = VR	Lemure = R	Mephit = C	Nightmare = VR	Rakshasa = VR
Stench Kow = C	-	-	-	-	-	-	-

(Notes)
 

Die Roll	Frequency
2	Arch-devil
3	Barghest
4	Daemon
5	Barbed devil
6	Achaierai
7	?
8	Nupperibo
9	Erinyes
10	Spined devil
11	Abishai
12	Mephit
13	Stench Kow
14	Nightmare or Rakshasa
15	?
16	Lemure
17	?
18	Hell hound
19	Hoardling
20	Imp

* Alternately; choice of two very rare creatures.
** Alternately; choice of two rare creatures.