You attempt to afflict a humanoid that you can touch with a nercomantic disease. The target must make a constitution saving throw. On a failed save, it contracts the disease and is poisoned for the spell's duration. On a successful save, it is not affected. 

A creature poisoned by this spell takes 1d8 poison damage at the end of each of its turns, and its maximum hit points are reduced by that much. If the target is reduced to 0 hit points by this spell, it dies and its body is reduced to a pile of rotten remains.

At Higher Levels: When you cast this spell using a spell slot of 3rd or higher, the reduction of hit points increases by 1d8 for each slot above 2nd.