The Plaguebearer

Screams rang through the cold night and the Doctor burst out of his house, barely just grabbing his medical kit as he raced along the ominously empty streets. Arriving at the source of unrest, he discovered a young boy, lying down, coughing and sobbing. Instinct made the Doctor cover his face with his trusty surgical mask, and he was right in doing so. A closer inspection revealed the alarming truth. The red rash, the hacking coughs, and the huge black boils that had risen on the pale skin… this boy had the plague.

The Doctor should have been scared, worried, horrified, he knew this, but instead, he felt... fascination. How quickly could this disease spread, how many people could it kill? Hastily he took a sample, and commanded the boy’s family to be quarantined. Then, he hurried home to test this intriguing sample further. A week, and the Doctor finally held the result he was looking for. All he had to do was drop the solution on the path outside everyone’s houses, and the fumes would infect everyone who ventured there.

Your fascination with disease has made you strike a deal with an unimaginable being: Pestilence. Pestilence is the embodiment of all that is sick, twisted, and mangled. He teaches you in the ways of bearing the Plague, even infecting hosts that are normally immune to these effects.

Mutagen Craft

At 1st level, you become proficient in the medicine skill.

The Afflicted

At 1st level, you have been infected by the plague, but your link to Pestilence keeps you alive. You become immune to natural disease, but not magical disease such as mummy rot. In addition, you become immune to the poisoned condition and resistant to poison damage.

Infect

At 3rd level, when you attack a creature or you hit them with a spell that deals poison and/or acid damage, they must make a constitution save against your spell save DC or become infected. Infected creatures gain the poisoned condition. Infected creatures can repeat the save on subsequent turns, ending the effect by itself on a success. If the infected creature fails 5 saves, the creature cannot make any more additional saves. The creature remains infected until the next dawn or until you use an action to end it. You can use this ability a number of times equal to your Proficiency Bonus + your Charisma Modifier. This ability does not work on constructs.

Contagious Disease

At 6th level, your disease can now spread from your subjects into other hosts naturally. Whenever a diseased creature attacks a non-diseased creature, the clean creature must make a constitution save against your spell save DC, or become infected and gain the poisoned condition. Only creatures directly infected by you can spread the disease in this way.

Mutating Pathogen

At 14th level, your disease mutates so fast as if to overcome natural and magical immunity to it. You can now infect living creatures that normally have immunity to disease or the poisoned condition. This ability does not work on constructs.