Hueco Mundo Geography/Espada History

The Espada loosely formed a very very long time ago as a fight club of sorts. In this huge section of sand dune desert there was an impossibly large and lone mountain that stood up, a rare sight for such a landmark really. Of course, Hollows and Arrancar congregated there due to it being something different and of course personalities and such clashed due to that. Fights broke out, people fought over the rights of the mountain and who would be the one to have it or just to enjoy its rather regal and upstanding mountainness.

This went on for a long looong time, until one day a rather enterprising and powerful came up with an idea. They beat the asses of all the beings that gathered there and forced them to become its servants. For reasons it didn't know, the being came up with the name Primera for itself and then named the next strongest down from there on in this weird language that shouldn't exist at this point in time.

That leader lasted a while, but it wasn't really a true group. It was more like a gang or bandits really that hung out by this mountain, fighting and beating up others. Over time the leaders were beaten and killed, someone else replacing them whether from inside of the ranks or just a random strong monster that wanted to see the mountain and ran across this group.

Some had bigger dreams and wishes than others, slowly but surely making buildings and homes near the mountain as they hollowed it out over time. At some point the Espada, as they were becoming known, began turning aside hollows due to how weak they were compared to arrancar and slowly but surely their influence and power over the sands grew.

Eventually though a powerful arrancar was brought to the Espada, who had begun to search out and gather them together for subduing. They swore fealty to the Primera... and then began to plot. Having large dreams, the Arrancar waited until the right time to take over and steal the power of the Espada for themself.

About three thousand years ago they did, taking them over and renaming their numbers. From then on, the Corona would rule them and the Primera merely their second in command and on down. This person is currently known as Saraiyu Sorainu, the Corona herself. Over the many years, they have done countless campaigns and collected many lands under her belt as well as the most powerful and interesting Arrancars (and a few hollows) she could find. The Espada were consolidated and then moved out to the other parts of the Endless Desert, becoming more than just thugs and instead more like rulers.

Many Espada have come and go under their reign, either being killed for treason or leaving at times... Recently, as in the past thousand years or so, the Corona has seemingly settled down a bit more after their bloodthirsty reign and control grabbing, however they are definitely times when that bloodthirsty and cunning nature rears its head despite how 'calm' they seem at the moment.

The Geography of Hueco Mundo can seem bland to outsiders, what with its endless night, cool temperatures at times and desert features but it isn't all sands and dunes really. There are many different features of the Endless Desert that most might not be privy to or even have experienced really due to how immense the place is. Even one such as Sarai could have spent her entire existence mapping it out and still be missing large sections or features really. On top of that, as the place is the missing bits between the world, it isn't always physically in the same spots.

Going 'West' from Sarai's Tower for several thousand miles might have once lead you to the salt like flats where no hollows at all live but where deep tunnels and cave systems dwell under, but now it instead leads to the Arch Scrubs. Temporal distortions are common in a world that isn't always entirely set on where things are. However Gargantas will always set one where one wants to be set, which is a major boon for those with access. The parts that seem to shift though area always seemingly 'set' sections. An example would be a scrub desert section vs a sand dune section, a scrub desert section surrounded on all sides by sand desert would be easy to tell the lines of where it might shift eventually... But anything in those lines will shift with it, and the sizes for the sections are immense in and of themselves as well, though there are minor size variations really...

Mirages are common in the desert, despite the lack of real heat, due to this fact. You could be seeing something in the distance, yes, and it would be a real place or thing... But walking there might not lead you to it.

The Forest of Menos exists below sections of Hueco Mundo's sand dune deserts areas, and much like the rest of it is seemingly moves around the further you walk in from where you enter. Other areas have the Caves, large areas of underground cave systems that aren't always connected to the surface or each other.

There are several different types of areas that make up Hueco Mundo's confusing upper landscape.

• Scrub desert type areas, where there is less sand sand and more solid land and small dead looking plants that somehow exist in the desert. They are common flat lands where hollows tend to congregate at times and form colonies due to the lack of  sand just pouring in over top of them. Hard rock like materials can be mined from such sections to be used to build things, much more easily.
  
• Sand dune type areas are the typical face of Hueco Mundo, typically where many beings show up and seem to see, due to them being the most prolific areas really. They are generally filled with the white sands that
  
• Salt flat areas are areas no hollow or arrancar like to stay, due to that caustic substance that causes annoyances and pain even to these regenerating beings, however the places are generally riddled with holes and caverns that lead deep into the desert where one of the few sources of water can be found. These sections are fairly rare really, so not many encounter them.
  
• Plateau areas are large areas with huge cracks running through them, mostly just rocky messes with jagged spikes. A drop down will lead into sections of the Menos forest.
  
• On top of these fairly 'normal' areas, there are quite a few weird or even dangerous places. A desert made entirely of glass with plants that grow while also being weird glass, a scrub land with sand that flows like water... A huge land of weird black and cold mud pits that any who fall in never return, a land where there seems to be some sort of black-plant surrounded oasis but the water when touched by any seems to erode or devour them.
  

Other than these section types, there are some major geographical features. Some areas have large mountains found in them, generally no more than a few really but still there. Large cracks down to the Menos Forest can be found in some areas or even cliffs. Springs or Oasis are very very rare and are fought over by hollows. Normally such rarities are settled by some Leader and then fights occur as someone else tries to take it over.

No one land is more settled than any other, other than the salt flats where only hollows/arrancar with special abilities to resist that awful place exist.