Terrortoma (5e Disease)

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Leaving their mindless disk to slink off and regenerate, the terrortomas break down into cancerous microbodies and creep into the tissues of a new host, absorbing nutrients and converting surrounding cells into small but fully functional young polyps. Cooperative hosts may enjoy the protection of the parasites, but suffer steadily escalating levels of aggression and seemingly boundless energy. Accidents are frequent, and unstable polyps are prone to explosion when jostled. Upon a host's almost inevitable demise, the surviving polyps break away in pairs, taking with them hunks of tissue to convert into new disks.
A creature can only contract this disease by being infected by a terrortoma. Symptoms begin appearing an hour after infection; the infected creature sprouts 2 polyps, and takes disadvantage on Wisdom ability checks. Before gaining the benefits of a long rest, the creature must make a Constitution saving throw with a DC equal to 10 + the number of polyps they have. On a failed save, they are overcome with manic energy and only gain the benefits of a short rest; on a failure of 5 or more, they also sprout a new polyp. Each polyp takes up a portion of the host's biomass and metabolic energy, reducing its maximum hit points by 5.
At the end of each of the infected creature's turns in combat, roll a d4 for each polyp; on a 4, that polyp makes a ranged attack (+7 to hit, 6 (2d4 + 1) fire damage) against a hostile creature it can see within 60 feet. Whenever the host takes damage from a melee attack, they must succeed on a Constitution saving throw with a DC equal to 10 + the number of polyps they have or have a polyp explode, dealing 9 (2d8) thunder damage to them and all other creatures within 5 feet.
When the infected creature is reduced to 0 hit points, the polyps break away in pairs and slough off chunks of flesh to make into crawling disks. The host takes 5 damage for each polyp they have, and a number of terrortoma macroforms equal to half the number of polyps, rounded down, appear in spaces within 5 feet of the infected creature. These terrortomas are unable to enter their microform to use their Infection for 24 hours.

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