Nine Hells

Nine Hells are an astral plane consisting of nine levels. Not much is known about them and they remain mostly unexplored by mere mortals. It is not certain how can one travel to the Nine Hells. It is however known that the time flows differently inside them. One day spent in the Hells is approximately one hour in the world.
The Nine Hells are known to be inhabited by devils and deamons and ruled by warlords. The inhabitants of the Nine Hells are in a permanent state of struggle for power and control. The most powerful warlords inhabit the ninth (final) layer of the Nine Hells. There are multiple fights and wars permanently going on on the first level. One of the known warlords is Sinbar.
The first layer of the Nine Hells was visited by the Crew of the Devilsfall during their mission to rescue a dwarf called Ozmok. They were transported there with the help of Salarus for a steep price paid in gold. The adventure's description can be found in the Imminent Doom's campaign's journal, chapter "The ass-kicking from Hell".
