The Bonecloud (GAP)

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: "Skeletal hands grasping at me, bony fingers clawing — it was more horrible than I could have ever imagined. An endless sea of undead killers, all rasping with ancient voices speaking only of death."
:: — A first-hand account of the Bonecloud
In what is called the War of Lies on a prime-material world named Terras, an ancient lich created an unimaginably huge army of undead warriors. It's said that when he was done, there were no dead left on Terras. In the face of this horrible foe, a wizard — whose name is lost to time — and a pair of priests of light opened a rift to the Astral Plane, sending the animated horde cascading into the Silver Void. 
Being undead automatons, the creatures can't move on the Astral — they've no real minds of their own. That means that there's a huge floating sea of the bashers simply hanging on the Astral Plane. That doesn't mean that they won't attack someone who gets within range, berk! The whole cloud drifts slightly, but for the most part, it's a big, unmoving feature of the plane, made entirely of animated dead.
Some of the undead in the Bonecloud consist of powerful and fearsome types. Though very rare, they exist due to the odd conditions of the location. See, the amount of undead in the Bonecloud, with the negative energy they possess, has opened a tiny rift leading to the Ethereal Plane and a pathway to the Negative Energy Plane. This allows the top-shelf undead, like vampires or wraiths, to exist within the area of the cloud even when they shouldn't be able to on the Astral.
The more intelligent undead that were banished with the animated skeletons and mindless zombies remain in the Bonecloud for a number of reasons, despite the fact that they can move on the Astral (albeit, for some, slowly). Ghouls and ghasts feast on the other undead. The wights, wraiths, ghosts, and vampires remain there because of their link with the Ethereal or Negative Energy Plane. They are effectively trapped within the Bonecloud because of that link - they cannot venture out into the rest of the plane. Supposedly, some of the more powerful and intelligent among them plot and scheme for a way to master all the dead in the cloud and somehow mobilize them. Chant is, there's more than one living necromancer or other basher who's trying to tumble to a way to get them all to move and make them an army again.
Travelers should be aware of the Bonecloud's existence. Wandering into it could be the last thing a leatherhead does. From far off, it appears to be a faint, bone-white smear across the Silver Void. It's not until a body gets in normal visual range (about 200 yards) that he can see the actual skeletons and zombies that comprise the Bonecloud. Even then, a basher's only seeing the very edge of the phenomenon. By earthly standards, the cloud is hundreds of miles across. 'Course, that doesn't really mean anything in astral terms.
The point is, it takes from two to six hours to go around it (which is probably a cutter's best bet). The negative energy involved creates a lot of mental drag, adding considerably to a basher's travel time. But what's a body to do? No one is going to go through this mass of undead willingly, right?
Wrong. See, a few canny cutters have "hollowed out" places in the Bonecloud and built fortresses. By using undead-destroying magic, they eradicated all of the undead in an area within the Bonecloud, thus creating a safe zone in- side the mass. 'Course, the inhabitants still have to be powerful enough to deal with wandering, intelligent undead that do indeed move, but these mobile undead are thankfully rare. 
What's more, there are plenty of color pools that a body might want to get at within the Bonecloud. In fact, it's known that pools leading to Mount Celestia (somewhere near Heart's Faith), the gate-town of Rigus on the Outlands, and Alfheim on Ysgard can be found within, as well as hundreds of others. Chant is, some real nasty berk severed a conduit that runs through the Bonecloud, and now the conduit dumps anyone using it into the heart of this undead sea.
If a body wants to get to a location within the Bonecloud, there's only about two ways to do it. The first is to use teleport or some similar magic. That's the easiest and safest way — but it's not ~\ always available (that sort of spell is top-shelf magic). The second, much harder way is to fight through. Here's when having a priest on a body's side really helps out. A priest that can turn undead ' to the degree that they are destroyed can simply use this power to clear a path, at least through the . minor undead of the cloud. Regular turning doesn't , help, because the undead can't go anywhere - that's why they're here in the first place.
Use Table V below to determine the type of undead encountered in the Bonecloud. Most individual figures are five to ten feet apart (yes, berk, that means that there are millions of undead in this cloud).
 Table 5: Bonecloud Undead Encounters
01-50	Skeleton
51-75	Zombie
76-80	Skeletal Animal
81-85	Skeletal Monster
86-90	Giant Skeleton
91-95	Monster Zombie
96 	Heucuva*
97 	Ghoul”
98 	Wight*
99 	Ghast*
00 	Special*
: * These creatures are able to move (although some very slowly), yet stay within the Bonecloud nonetheless. 
Special results are determined by the DM. These encounters can include various types of undead such as vampires or undead beasts.