The Gods in the UnMen campaign are pantheon based, primarily. They were created largely by collective human belief in a higher power than themselves. By the time WW1 sets about, the pantheons have largely fallen into decline with the rise of monotheism. In that, humans have been drifting towards having their fate ruled over by one overwhelming authority rather than powerful individuals with their own specialties.
Because of this, several of the gods have simply withered as they are sustained by their relevance with sapient beings. Without active worshipers, many began to perish, go mad, or become diminished. Some have even entered a ghostly near death-like state. However, gods that are popular and well known such as those without active worshipers, still prove hale and hearty. Many enjoy a retirement of sorts at the End Mile kalpa. And few other have learned to sustain themselves, if they were even ever acknowledged beyond passing by humans. As some seek to redeem their potency by making legends of themselves again, ala Serket.
The pantheistic gods are generally powerful and whimsical beings, often with special focuses that define them. Some are said to be legendary universe creators, but in truth they only hold a certain sway within that context. However, within their mythologies, they lived through all the stories known about them when they were in the height of their relevance. It is unclear how or where such things like this occurred, but it suggests the gods had their own pseudo-reality alongside the real world.
In light of the seeming begin to the end of the universe, the celestial bodies pressure the gods into seeking out the UnMen and other forms of life if they wish to save themselves from higher wrath. The Gods, meanwhile, reveal to the UnMen about their intent to protect them clandestinely and use the upmost incompetence against attacking them as well deception in actually serving the celestial bodies. Here, a clear division is made.
The gods come in several kinds of statuses, as follows.
Pantheistic gods. This is a group of active and ongoing deities that aren’t as relevant in the modern day but have lost little of their potency due to their popularity or their ability to find a way to sustain themselves without worship. The Greek, Roman, Egyptian, and Nordic pantheons are especially prevalent. Zeus and Vulcan ranks amongst these.
Fallen deities. This category consists of three subtypes: Dead (a genuinely slain deity.). Diminished (gods that have lost most of their power and are barely more than strong mortals). And Faded (Gods that exist in a semi-dead state, occasionally rising and returning to a torpor.) Hades, Serket, and Xbalanque fit the respective categories here.
Ur-Gods. An unknown group of extremely primitive gods that may have existed around the time of cavemen and Quarlangians, which might make them the first deities or spirits. They are universally assumed Dead at this point.
Alien Gods. Antimatter beings from Pelangia that cannot communicate in normal circumstances. They generally don’t exist in the normal universe, but the dying ones may end up in the ashes of End Mile.
Lastly, the fate of Gods who become completely dead is to turn into the ash that can be found abundantly in End Mile.
(The following is an organized list of the various deities seen in the UnMen campaign, even if they were not entitled to their own entry.)
Greek: Zeus, Ariadne, Hades, Poseidon, Artemis
Roman: Bacchus, Vulcan, Cupid, Hercules, Terminus, Morpheus
Mesoamerican: Xbalanque, Quetzacoatl
Miscellaneous: Santa Muerte, Amon
Fictional: Sweet Jane, Bhangrevav