Cadaver Moth (Wild Magic Mutant)

Necrotic spores. The beating wings of the moth extrude spores. Other Wild Magic Mutants get resistance to necrotic damage while in 120 feet of the Cadaver Moth.

Additionally if a not Wild Magic Mutant creature ends its turn within 10 feet or hits the Plague Moth, it has do make a 15 DC Constitution Save or take 3d6 necrotic damage.

Flyby. The Cadaver Moth doesn't provoke opportunity attacks when it flies out of an enemy's reach.

Black Cough A none infectious disease caused by the death wind of the moth. Infected can´t regain hit points. They don´t regain exhaustion through long rest, instead have to test against a 15 DC Constitution Save or gain 1 additional exhaustion point if a long rest would be needed. If a target dies while infected, a Cadaver Caterpillar bursts from the body, if the target was at least of medium size. 

The disease can be cured via the means of Lesser Restoration and up or a successful Medicine Check of 20 which takes a short rest of time. 

A creature can´t be infected by the Black Cough and another disease/parasite of another Wild Magic Mutant

Death wind. The Cadaver Moth  unleashes a 60 foot cone of spores. Non Wild Magic Mutants are have to make a 15 DC Constitution Save. On a failed save the target takes 3d8 necrotic damage or half on success.

Also on a failed save, the target suffers the effect of the Black Cough.

Infectious life. As a reaction, if a Non Wild Magic Mutants creatures dies within 30 feet of the Cadaver Moth, it saps into the dying energy. Every Wild Magic Mutant within 30 feet of the dead creature gets the targets hit dice x 2 temporary hit points. At the beginning the Cadaver Moths turn a Cadaver Caterpillar bursts from the body, if the target was at least of medium size.