Blood Storm (DoS:2)

The sky weeps bloody tears as bolts of coagulated blood fall in a 20ft radius cylinder. Each enemy in the area must make a Constitution saving throw. On a fail, a creature takes 10d8 necrotic damage and receives the diseased condition and decaying condition*. On a success, a creature takes half damage and is not diseased or decaying. Everything in the area is covered in blood. 

Diseased: "Red runs" - The creature begins to bleed uncontrollably. The creature has disadvantage on Constitution checks and Constitution saving throws until cured. 

Decaying: When a creature that is decaying is healed, it instead takes necrotic damage equal to the amount that would have been healed.