Issue #22966: Cut Disease: Black Heart Blight
From Morrowind was supposed to make a return! Was to be added in Dragonborn.
Black Heart Blight xx01ff2e Drains 10 points from Carry Weight.
Doesn't have a source currently to give you the disease otherwise should work. My suggestion? Give it to Ash Spawns as probably intended.
They come from the Red Mountain which was the source of the blight disease.