The Vault - World Breakout

The cities lies in ruin, the lands are corrupted, dead, deserted...
The cause was unknown, but a strange disease spread across Azeroth like wild-fire. The first symptoms was regular colds of flues, but evolved into more... Advanced... Organisms...
Before anyone knew, the diseased number grew rapidly, and they fell into coma about a week after the first symptoms.
The doctors and scientists were baffled, how could such a disease show up from nowhere and effect alomst all of azeroth?
They took blood samples, and began studying the diseased and comatized, hoping to find the cause, origins, or simply meaning of the virus.

A series of failures and discoveries were found. Failures, to that they could not seem to determine what the virus was, or what it did to the diseased, and discoveries such as immunity. A rough 5% of Azeroth were immune to the disease, and because of falling disease numbers the doctors and scientists began to think the virus was passing.
They were wrong.

One day, at an important scientific research with a comatized patient, the patient suddently started to turn bleak. Skin appeared to be falling off of the patient, aswell as heartfailures and brainmalfunction.
The last thing that was heard from the research facility was ''Lock the doors!''. This was located in Dun Morogh.
Several days later, King Magni Bronzebeard and High Tinkerer Mechatorque issued an order to search the facility, thus opening it's doors.
A searchteam was sent in, finding the place in a bloody mess. Litteraly. Blood everywhere. But no corpses.

The searchteam journeyed deeper into the facility... They found walking corpses. Zombies. The place was filled.
Two out of the twenty-five people sent in returned. The doors weren't sealed when they ran for their lives away from there.
Out ventured the walking dead.

This had begun happening everywhere on Azeroth, even Northrend, even on Kezan. The Alliance and the Horde held an emergency meeting, both within themselves, and then with each other.
They slapped a stamp of ... ''Truce''... between the factions, and started building an underground-bunker-city, later as to be known as the Vault.
Nobody liked the so called 'truce' between the Horde and the Alliance, but the leaders were forced to, given that all of Azeroth was falling appart. Nobody was safe, cities and towns, aswell as villages and single-residence houses had been slaughtered and turned into walking dead. They had to slam themselves togheter, in order to survive.

The Kings and leaders of Azeroth's Horde and Alliance races were parted within their own sections of the Vault, and other races also sought refuge from the expanding hordes of the walking dead. Only but the mighty Dragons, or the in-humanoid/beasts were safe from the virus.
Even though the Dragons were immune to the infection, they disguised themselves as mortals and hid deep in the Vault, along with the other races.

All who got sick were watched extremely strictly, and examined for a week, had the cold/flu not passed by then, they would be either executed or thrown out from the vault, leaving them to fend for themselves. Outside, the vault was heavily barricaded, and guards safely stationed pretty much everywhere, aswell as a chosen ''army'' of surviving races inside the vault were chosen to be the peacekeepers of the city.

Now, as one of the survivors, or Immunes, you must find a new heritage deep within the ever-expaning, ever-growing, and ever-conflicting Vault in Dun Morogh. Perhaps there are survivors out there, perhaps not, but will you be able to find out?