Decompose

You touch one creature you can reach. The target must succeed on a Constitution saving throw or take 2d8 necrotic damage and suffer a -2 penalty to its AC until the start of your next turn as parts of its flesh momentarily wither and decay. On a successful save, the creature takes half damage and suffers no penalty to AC.

If you target a corpse or a pile of organic material, it decays rapidly, accelerating the decomposition process to the point where 1 cubic foot of material turns into dark, rich soil.

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the necrotic damage increases by 1d8 for each slot level above 1st.