Pitiless (GAP)

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For many millennia (or longer), folks have used the Astral as the place to send their refuse: cursed items, magical experiments gone awry, and unwanted berks who have been banished from their societies.
A group of bashers decided to take up the reins and control this aspect of the Astral Plane, creating a prison/ warehouse for unwanted people and things. Pitiless has a reputation second only to Carceri itself as the most horrible prison of the planes.
The commandants of Pitiless are twin dwarf Doomguard members, Aorth With No Heart (Pr/♂ dwarf/F10,T10/ Doomguard/NE) and Jaich With No Spirit (Pr/♂ dwarf/F9, C9/Doomguard/CN) who believe that contrary to what folks think, things do decay on the Astral. To prove their point, they created Pitiless to hold things there for a long, long time and observe the (albeit incredibly slow) changes. The brothers may differ in alignment (Aorth is more cruel, Jaich is less controlled), but they work well together. Chant has it that these two dwarves have been watching their charges in Pitiless for over a thousand years.
Pitiless is located in an area known as the Deadmind, because there are no drifting thought energies here. The psychic wind never blows. The prison itself probably created this zone, when all the random thoughts that were here coalesced into astral searchers through the anguish Pitiless has caused. These searchers have long since left or been destroyed, and now there is only emptiness. This void within the void keeps out most astral creatures, including githyanki, astral dreadnoughts, and other dangers.
The masters of Pitiless employ a number of guards which many (especially primes) would consider odd allies for a pair of dwarves — a regiment of 50 well-trained frost giants. Nonetheless, the giants and dwarves respect each other and get along well. The giants' presence tends to make Pitiless a cold place. (A body can always see her breath there, and many prisoners claim they haven't been warm in centuries.) 
Chant is that a yugoloth (or perhaps a whole entourage of the fiends) visits Pitiless on a regular basis, but the brothers deny it, so no one knows the purpose of the visits (if any).
==Warehouse Section==
There are two main areas of the warehouse section. The largest is a chamber filled with crates and other containers, each filled with hazardous objects and substances like minor cursed magical items, special poisons, acids, and malfunctioning or botched enchanted devices. These are organized and cataloged.
The other area in the warehouse section is the individual vaults. These contain the particularly horrible things that are a danger to those around them (or sometimes to a whole world or plane). Artifacts, banes, lich phylacteries, fiend-possessed items, and even an uncontrollable sphere of annihilation remain here — perhaps (hopefully) forever
Four on-staff wizards (Pl/var/M9-M12/var/var) provide the spells to neutralize some of the more dangerous items. They are paid well for their risk-filled work.
==Prison Section==
The prison section of Pitiless has no torture chamber. Such ministrations never occur. The horror of the place doesn't involve physical pain (except as punishments for unruly or unwanted behavior). It comes from the fact that the prisoners know that they are there for life — and time doesn't pass the plane. To make it worse, even if a body escaped and left the Astral, she'd probably die of old age as soon as she got away. Most of the time, the guards are busy keeping the prisoners from attempting suicide — that's considered an escape attempt.
The kind of prisoners found here are usually the vilest of villains condemned to eternal imprisonment, or foes who could not be killed and were banished to the Astral instead. A small handful are actually good-aligned folk of some repute (paladins and such) who were sent here rather than being killed, because their foes knew that putting them in the deadbook would only send them to the paradise of the Upper Planes - and probably into the armies marshaled there.
Many of the cells and confinement facilities are constructed with great enchantments to hold powerful prisoners. Some of these inmates are so powerful, in fact, that they had to have special cells designed just for them. The masters of Pitiless are more than willing to accommodate such things — it keeps the on-staff wizards busy, if nothing else. Rumors abound about the prisoners found here — some say even powerful fiends, aasimon, monsters of legend, and famous historical bloods are among the inmates.
Many have said that Pitiless may be one of the easiestto-run prisons anywhere, since many of the inmates never leave their cells, and none of them ever need to be fed (remember, no one eats on the Astral). Nonetheless, the masters keep themselves busy observing the prisoners (and the items in the warehouse), looking for signs of decay.