Timeline

Vampiric Influence
1923 - Vampire Nation begins construction of Crypts

2036 - V.L.A.D.Co becomes #1 on Fortune 500, and will hold this position until the end of Human Civilization

2084 - Extraterritoriality laws become commonplace

2087 - Mars is now 75% terraformed, and their atmosphere is completely breathable.

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Demonic Invasion
June 13th, 2108 - UNAC (United Nation Aerospace Coalition) begins testing on an experimental portal system on the surface of Mars to allow for instantaneous travel between the Mars colonies and Earth, as well as traveling between different locations on Earth.

October 22nd, 2108 - Due to interdimensional interference, the portal technology exposes the capability to peer into other realities and dimensions. Further experimentations are cleared as a section of the Earth portal network are used for these experiments.

October 31st, 2108 - Humanity accidentally stumbles upon Hell. Demonic forces catch a glimpse of Earth, and sets their sights on conquering it. UNAC immediately shuts down the portals, and further experimentation is cancelled in fear of a hellish invasion. Little did humanity realize that it was already too late.

April 23rd, 2109 - The portal network on Mars is hijacked, and demons from Hell begin to flood onto the surface of the planet. The UN scrambles to respond as Mars defenses are overrun, and shut down the portal network on Earth.

April 24th, 2109 - Vampires begin funneling as many humans as possible into Crypts under the guise of V.L.A.D.Co. Count Dracula von Tepes leads the UVA (United Vampire Armies) to Mars to slow down the invading forces.

April 29th, 2109 - The last human on Mars has died, being completely conquered by Hell's Forces. What remaining vampire forces return to Earth to begin fortifying and protecting the now 2/3rd filled Crypts. Dracula has been reported missing in action.

May 1st, 2109 - Demonic forces begin to invade Earth via orbital bombardment, forcibly taking the portal network and begins to open the gates to Hell on Earth. The UN responds with coordinated nuclear strikes on Earth portal locations. This proves to be a bad idea, as the demons are empowered by the radioactive hellfire. However, most of the portals are completely obliterated, making getting new demons to Earth far more difficult for Hell's Forces.

May 9th, 2109 - Demons, now realizing the increased destructive power of radiation, forcibly take all nuclear launch sites and begin to fire off missile payloads to begin the destruction of Earth. In a matter of 84 minutes, the entire globe is coated in radioactive hellfire as every last nuke on Earth is detonated. During this time, the Crypts that have not been taken have been sealed, leaving the rest of humanity to their doom. The Humans in the Crypts are informed about the existence of vampires. Those who resisted were turned into vampiric thralls. It is estimated only 3% of the human population made it into the Crypts.

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Nuclear Holocaust
May 10th, 2109 - As the Earth's atmosphere fills with irradiated ash, the nuclear winter begins. The few remaining portals to Mars maintained by the Demons leaks ambient radiation into Mars during this time period, causing the wildlife existing there to mutate very rapidly over the next few decades.

2137 - The winter from the nuclear fallout finally diminishes, and external temperatures begin to return to hospitable temperatures. Over 98.8% of the world's non-human surface dwelling animals have gone extinct in the past 21 years. Those that did survive have been horrifically mutated. The planet begins to regrow, however it's atmosphere is scarred forever, a layer of irradiated dust and ash perpetually hanging in the upper ozone layers. A majority of the planets landmass now remains submerged under water. Many now-mutant "Martian" animals end up making their way through the existing portals (mostly by accident), helping repopulate Earth's animal populations much faster than anticipated.

2250ish - Multiple Crypt sealing and resources systems fail, causing its inhabitants to be forcibly ousted into the wastelands. Many humans, vampires, and dhampirs end up dying when exposed to the irradiated and severely hostile environment. Due to the toxicity (and interestingly enough, although unintended vampiric influence) these beings begin to mutate rapidly throughout several generations, causing the wide variety of stable subhuman species to come into existence. Vampire society outside the Crypts barely holds on by a thread, and even with the technology developed during the short time in the Crypts proves helpful to basic survival, the rebuilding process is basically nonexistent to those in the regrowing wastes.

2260ish - The Disciples are formed,

2300ish - The last vampire not in a crypt perishes, leaving those dwelling on the surface to their own devices. A

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The Emergence
October 31st, 2700 - The remaining Crypts unseal. Due to the atmospheric scarring, most vampires are able to traverse through the day, however direct exposure is still very painful and potentially lethal in longer periods of exposure. The technology developed in the crypts during this time proves to be invaluable, as new energy sources are discovered, collected, and used to the betterment of humanity and.