Hollow

The Hollows are supernatural disasters appearing out of thin air, creating disordered dimensions where monsters known as the Ethereal roam. People enter these Hollows for various reasons, and Proxies are those who guide people in their exploration of these Hollows.https://www.hoyoverse.com/en-us/news/102144
Contemporary civilization was destroyed by the Hollows, but one civilization known as New Eridu managed to survive the apocalypse by acquiring the technology to extract valuable resources out of the Hollows. The Hollows then became industrialized and monetized under the city's administration, which gradually led to the increasing tension between monopolistic enterprises, gangs, conspirators, and fanatics.
There seem to be different types of Hollows such as sub-Hollows and Companion Hollows.
==Description==
Hollows are an unknown phenomenon where a sudden black sphere appears out of nowhere. These Hollows swallow everything unfortunate enough to be in their path. While Hollows can appear spontaneously, they usually give a sign before appearing, such as vibrations in the surrounding area, electrical malfunctions, and certain objects disappearing from their initial place and reappearing in a completely different location.
===Corruption===
Once swallowed, both non-living and living beings inside the Hollow will be subject to Corruption. Non-living objects will form Ether crystals. The deeper the part of the Hollow, the higher the concentration of Etheric energy in that place, which can accelerate the corruption and increases Pressure. 
For humans, the time before corruption takes a toll on their body depends on their Ether Aptitude and equipment. Some people have high Ether aptitude, allowing them to explore Hollows for extended periods without suffering the effects of Corruption. Those with low aptitude can still explore Hollows by wearing Anti-Ether Corruption equipment, which is commonly used by PUBSEC officers, Jaegers soldiers, and thugs. If a human is corrupted, they will turn into an Ethereal.
Intelligent machines can also be corrupted if they have passed the Forbidden Fruit test.
===Environment===
Once inside the Hollow, everything appears normal, with the same weather as outside the Hollow. However, everything inside is shifted by the Hollow's fissures, turning it into a maze with layers of distorted places. What seems like a dead end can be a way out of the Hollow or an entrance to a deeper part. The deeper the Hollow, the higher the concentration of Etheric energy, which accelerates Ether corruption and attracts swarms of monsters.
Hollows are naturally complex places to explore, and being careless can lead to death for inexperienced and experienced explorers alike. To safely explore Hollows, many explorers bring Bangboo with them. These Bangboo are equipped with the Carrot program, which guides explorers along safer paths, minimizing the chance of falling into the deeper parts of the Hollow.
Hollows are a natural source of Etheric energy, which has been successfully harnessed by the people of the new era as a new energy source. This method involves placing a pipe network underneath the Hollow. The pipes absorb Etheric energy produced by the Hollow, which is then converted into usable energy. After the Etheric energy is converted, the leftover Ether corruption is released into the air through "Shiyu". This method is very efficient for obtaining Ether energy while also preventing the Hollow from expanding further.
===Dangers===
According to the New Eridu City Administration, there are various dangers and types of people one can encounter inside Hollows: 
* The Ethereal: mutant monsters that attack all foreign living creatures.
* An Unknown Substance that is as ubiquitous as air, with great potential as a resource, but also mysteriously corruptive.
* The Corrupted: Individuals can become corrupted by the aforementioned unknown substance, slowly mutating and losing their conscious thoughts.
* Lawless Thugs: There are criminals out and about inside the Hollows.
* Hollow Raiders, Proxies, and the just insane.
* Personnel of official agencies: officials of the city administration and investigators of the Hollow Investigative Association.
==Known Hollows==
===Hollow Zero===
Hollow Zero, also known as "Limbo," is a colossal Hollow that consumed the old Eridu, resulting in its destruction, and serves as the source of several massive Hollows in and around New Eridu. The investigation and neutralization of Hollow Zero pose a long-term challenge for the authorities of New Eridu, both presently and in the future. 
===Original Hollows===
The original Hollows, also known as primary Hollows, are the six Hollows in the Hollows classification. They large in scale, have complex environments, contain Ethereals of varying strength, and many other factors suited to veteran Proxies and Hollow Raiders.
Name 	Description
Cretan Hollow 	Located on the border of the Janus Quarter, Cretan Hollow neighbors the desolate old capital area. Its impact on citizens' daily lives is relatively minor, but it still often causes disaster alerts in the eastern districts. 
"Long had the throne fallen, with beasts caged in eternal struggle. And the gods as ever watch in silence." - A verse was carved onto the wall of a deserted tunnel in the old metro swallowed by the Cretan Hollow.
Lemnian Hollow 	Located in the northwest of the Old Capital Isthmus, Lemnian Hollow resides at a considerable distance from the citizens of New Eridu. However, it is also the most active among its six siblings in New Eridu and the residential areas are frequently troubled by the presence of its Companion Hollows.
I was once told a legend from the old civilization: Amidst the isles of Lemnian, our ancestors raised grand temples and sacred shrines. But in the new world, this story looks different: Deep in the depths of Lemnian lies an abyss, infested with the nests and lairs of the evil. Cease your prayers. Cease your prayers.
Hawara Hollow 	
Pursenas Hollow	
Solove Hollow 	
Papago Hollow 	
===Companion Hollows===
Name 	Description
Dead End Hollow 	
Nest Hollow 	
Ballet Twins Hollow 	
Fourteenth Street Hollow 	
Icedrift Hollows 	
Lemnian Hollow's Companion Hollows	
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