The Common Cold
Common
Just a cold. You’ll cough and sneeze, but that’s about it. You’re already gonna have a stat decrease because of the diseased condition.
Common Infection
Common
Common Causes: You somehow ingested organisms carrying a weak infection.
Effect: Due to the infection trying to attack your immune system, you gain disadvantage on stealth rolls. When you get the infection, roll a d6 to determine what gives you disadvantage.
You cough every few minutes
Your bones ache and are difficult to be quiet with
Your sore throat makes breathing loud
You sneeze every few minutes
Sewer Rat Flu
Common
Common Causes: Obviously from sewer rats, being bitten transfer’s their disease ridden infection into you.
Effect: Three times per day, the DM must tempt you to vomit. If that doesn’t happen, you let it out right before a long rest. When the DM calls upon this, roll a DC 10 Fortitude save. Every time you save that day, the DC increases by 5, resetting at long rest.
Upon vomiting, you stop everything you’re doing. You lose your turn in combat and break concentration on whatever you’re maintaining.
Additional Notes: Orcs and Drow are immune to this disease.
Desert Fever
Common
Common Causes: An infection carried by living vectors that survive in hot or cold areas.
Effect: Skin takes on a red tinge, fever & bouts of cold sweat. Take a point of damage for every hour you spend in an area the DM would consider pretty cold or warm.
Moor Plague
Common
Common Causes: Dirty water carrying disease is able to get into a cut or scratch.
Effect: Your skin slightly turns a puke green and you emit a foul stench. Until this disease is treated, your speed is halved.
Arthritis
Common
Common Causes: You come into contact with someone’s blood who’s already infected wtih this.
Effect: After about a week, the incubation period of the disease ends as your hands and feet begin to swell and become tender. You lose 5ft of movement speed and gain disadvantage on all dexterity rolls.
Warning: If not treated quickly enough, within a few weeks, there’s a chance that your hands and feet go numb and you’ll be put in the paralyzed condition.
Wrym Flu
Uncommon
Common Causes: Many of the organisms that carry this infection are lizards or draconic beings. Usually gets into your system through exposed injuries. This has caused suffering on many dragons before.
Effect: You gain a permanent level of exhaustion until you can cure this disease.
Frogtongue
Uncommon
Common Causes: The living vector you could catch this from is frogs or other amphibious creatures.
Effect: The afflicted tongue gradually becomes malleable and sticky, like a ball of taffy, you lose the ability to speak orally.
Fuchs' Dystrophy
Uncommon
Common Causes: If an infection gets deep enough into your body, they might be able to mutate enough genes to cause this.
Effect: This illness attacks the eyes of the patient, slowly eroding his vision. Patients tend to see an increasingly opaque white fog obscuring their vision. You are put under a blind condition until you somehow treat this disease.
Beggar’s Pox
Uncommon
Common Causes: All the infection has to do is touch your skin.
Effect: weeping sores break out over your face, making you hard to look upon. You have disadvantage on all social charisma rolls unless you have a face cover.
The Dreaded Mallergy
Rare
Common Causes: Formerly a weaker infection, the contagion has mutated and this disease is the result.
Effect: Dread fills you. Within 48 hours of getting the Mallergy, you are bedridden and paralyzed, sweating violent amounts.
Warning: If the disease lasts for any longer than a week, their body will succumb to the infection and perish.
Vorel’s Phage
Rare
Common Causes: A mutated contagion that can somewhat bypass your immune system and can personally interact with it without immediate extermination.
Effect: You gain a permanent level of exhaustion that can’t be gotten rid of, you’ll have it as long as you have this disease. When performing any extreme movements, you take a level of damage due to the sheer pain of your moving swollen joints.
Warning: Once you have had this disease for a week, the DM will need to roll Death’s Door for your character every dawn until you either cure the disease or you die.
Additional Notes: If this disease kills a creature, their corpse will rise after a week acting as a pseudo zombie. The corpse's sole purpose is to spread the virus through bites. The corpse has all of the capabilities of the body it overtook.