I had considered making a monster entry for today, but I thought that I would instead go for something a little more frightening. Like a zombie menace, there are some existential threats that can’t just be cut down by a sword.
The apathy virus is an insidious diseases that is spread subtly, laying low entire populations. What it does not do, however, is directly kill the infected, but instead causes them to lack the will to live or thrive. The virus may originate from many sources, up to and including sadistic death cults, apocalyptic horsemen, and aggressive biological weapons engineers.
The worst part of this virus is that it can spread quickly due to it not being immediately lethal, and having a very long incubation time. Worse yet, many of the symptoms are not readily recognized as being signs of infection. Within one week of infection, victims suffer from a mild depression and lack of energy. After approximately two weeks of being infected, victims begin having a lack of appetite, and sink deeper into depression.
In the final stages of the disease, victims merely lay about waiting to starve to death, and are not easily roused or woken. Approximately 10% of the victims simply fall into a coma, while 85% simply die of starvation. This process will destroy a given population center within a handful of months, bringing the collective society to a halt.
A mere 5% of infected are able to function in an almost zombie-like state, attempting to survive with as little exertion as possible. These “survivors” will often die due to predation, accidents, or simply not being able to feed or care for themselves, sometimes contracting other diseases due to lack of hygiene. So called survivors are also likely to continue spreading the disease, often living long enough for ill-fated rescuers to discover them and become infected.
If caught soon enough, the disease can be quarantined and controlled. The cure, interestingly enough, is overwhelming happiness. Some magics are effective at creating positive emotions, and thus remove the infection. More mundane attempts to combat the virus have sometimes relied on opiates and liquor heavy festivals.
Given time, the disease will die out with its infected victims. When properly treated, victims can recover within a day.
5e Statistics: The apathy virus is airborn, and spread by exposure to an infected individual. Exposed individuals must make a DC 11 Constitution saving throw, becoming infected on a failure.
Once infected, symptoms develop within 4+1d4 days. Symptoms manifest as levels of exhaustion; when the symptoms have manifested, the creature must make a Charisma saving throw after each long rest. On a failure, the creature gains a level of exhaustion. This exhaustion is not physical, but has the same penalties tied to it.
These exhaustion levels can only be removed by magic, or by experiencing great joy. This joy can be reuniting with a loved one, or hearing a beautiful song. Not all joy is created equal; some joy can remove all levels of exhaustion, while some are small enough to remove only one or none at all. Once all levels of exhaustion have been removed, or if joy is felt during the incubation period, then the disease is expelled, and the creature is inoculated to the disease.
It should be noted that this disease may affect only a certain race, may or may not include animals, and can vary in its intensity or length of incubation. Some creatures may or may not have a natural immunity to this virus, perhaps as many as 10% of the population. If the creators of the virus are especially cruel, these immune may or may not function as carriers.
Adventure Seed: The adventurers come upon a city of dying city. The few functioning survivors are at a loss for what to do, and ask the players to help while also warning them to stay away. The city stands as a bulwark against a great danger (perhaps an orc tribe), and its loss would devastate the region. The players must first research the nature of the disease, keep it from spreading outside of the city, and discover a functional cure for the abundance of infected people, all while trying not to contract it themselves.