DoD: Pandemic

You infect one creature you can see within range with a deadly and highly infectious disease which lasts until it is cured by greater restoration, heal or wish. Other spells and magical effects which remove diseases fail to cure the infection caused by this spell.

While infected, a creature must make a Constitution saving throw at the start of each of its turns. On a failed saving throw, it takes 10d8 necrotic damage and becomes incapacitated until the start of its next turn. On a successful save, it takes half as much damage and is not incapacitated. An infected creature must make the saving throw at the start of each of its turns until it dies or is cured.

A creature who starts its turn within 10 feet of a creature infected by this spell must make a Constitution saving throw. On a failed saving throw, that creature contracts the infection.

When you cast the spell, you can choose yourself and up to eight other creatures to be unaffected by the infection caused by this casting of the spell.