The disease known as rosen doom is identified by the haunting reddish hue that affected corpses take on. The blood of the deceased victims also remains a strange reddish color even decades after their death, partially preserving corpses, and retaining the virulence of the disease for just as long.

This disease is primarily spread through contact with infected blood, although any bodily fluid can transfer the disease. A creature that makes contact with such a fluid must make a DC 16 Constitution saving throw, becoming infected on a failure.

Symptoms develop within 1d4 days. Infected creatures suffer 1 level of exhaustion. While exhausted, the creature coughs blood and develops weeping sores across their body. At the end of each long rest, the creature must make a DC 16 Constitution saving throw, taking 11 (2d6) necrotic damage on a failure and gaining 1 level of exhaustion.

On a successful save, the DC of the saving throw is reduced by 1d4+1. When the saving throw DC becomes 0, the disease ends.