Scrabies (5e Disease)
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This disease begins with an insect bite, initiating an infection marked by a full body rash of painful, itchy red welts, an uncontrollable terror of small arthropods and persistent, escalating delusions of their presence. At the peak of a scrabies outbreak, every living host will develop a single young macroform within a large, painful blister in their flesh. Emergence is not usually fatal in itself, but the young fectoid will typically turn on its host for its first meal.
A creature can only contract this disease after being bitten by an insect carrying scrabies. Symptoms begin appearing 2d12 hours after infection; the infected creature is covered in irritating welts, reducing its speed by 10 feet and only letting it use either an action or a bonus action, not both, on its turn. Whenever an infected creature sees an arthropod or experiences something that causes an association with insects, it must make a DC 10 Wisdom saving throw. On a failed save, the creature becomes becomes frightened; while frightened this way, it has disadvantage on ability checks and must use its movement to move to the nearest safe spot from which it can't see the triggering stimuli.
At the end of each long rest, an infected creature must succeed on a DC 13 Constitution saving throw or have the DC for the save to avoid becoming frightened by insects increase by 1d4.
After 4d4 days or when the DC for the save to avoid becoming frightened by insects equals or exceeds 20, the infected creature will begin to develop a large blister and become incapacitated. After 1d4 minutes, the blister bursts and a scrabies macroform emerges in a space within 5 feet; this scrabies has the memories and personality of the original that infected the creature, and is unable to enter its microform to use its Insect Infection until it has drained a total of 15 hit points of blood.
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