True Zeitgabberim {5e}

Forged in the laboratory and unleashed upon urban areas, the Z-virus has wrecked havoc across the land. Entire civilizations have fallen as the infection spread, causing disarray and confusion as authorities struggled to control it and understand its effects. While many infected have been purged, many more have found safety in numbers and escaped civilization at large, founding their own societies. While most simply wish to be left alone, a handful fall victim to their urges, murdering humans in order to feast upon them.
The following "human-based" races can become True Zeitgabberim, and benefit from Medicinal Cannibalism:

• Aasimar
• Half-Elves
• Half-Orcs, if the non-orc half is human
• Humans
• Kalashtar
• Simic Hybirds, but only ones derived from humans

Generally speaking, only mammals can be infected. Specifically, the following races are completely immune, either due to being non-mammalian or due to a particular kind of magical heritage:

• Aarakocra
• Dragonborn
• Genasi/Genies
• Grung
• Kenku
• Kobold
• Lizardfolk
• Locathah
• Tortle
• Warforged
• Yuan-ti

All other "canon" DND races may become infected, but cannot benefit from Medicinal Cannibalism. Shifters and polymorphed creatures can become infected if they are in a mammalian form at the point of infection. If a race eligible to becoming True Zeitgabberim is in a mammalian but non-human/human-derived form at the point of infection, such as a half-elf druid in a bear form, they become True Zeitgabberim once they turn back into a human/human-derived form.

Ability score increase: Your Constitution score increases by 3.
Age: Zeitgabberim reach adulthood at the same time as their base race, but tend to live about 20% longer on average.
Alignment: The most well-known group of zeitgabberim reject the law of the land and thus they are often associated with chaos. However, they can have any alignment, especially if raised outside of zeitgabber society.
Size: Medium
Speed: Base walking speed is 30 feet.
Languages: You speak Common. You are also able to communicate with other zeitgabberim using pheromones.

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Diehard: When reduced to 0 HP but not instantly killed, you spend only one round unconscious. During that round, make and keep track of death saves as normal. Provided you are still alive your next turn, you wake up and are able do one of the following actions per turn:

• Move at half the walking the speed you had before being reduced to 0 HP
• Cast a cantrip (you may cast Spare the Dying on yourself)
• Perform a basic melee attack at half the damage, rounded down

You are still able to perform reactions. Continue making and keeping track of death saves in this state. You may only use this ability once per long rest, and you will be drooling infectious saliva the entire time.
Drooler: You require 50% more hydration than most other races to make up for that lost from your mouth and unique digestive system. Additionally, if your character uses a spell that requires concentration, and/or have their hit points reduced to less than half of their maximum, they must make a DC 15 charisma save; upon failure, they begin drooling infectious saliva from their mouth.
Meat-Powered: For every 48 hours you go without consuming some form of animal product, gain one level of exhaustion. This stacks with any exhaustion you may gain from starvation.
Medicinal Cannibalism: True Zeitgabberim are plagued by a twisted desire for the flesh of their own. Should they give into this, they will find a number of benefits, which taper off over time.