Attenuating Fungus

Reconstructing fungus festers in the wounds of a willing creature you touch, granting a number of hit points equal to 2d10 + your spellcasting ability modifier. A creature that heals via this spell is affected by the poisoned condition and has disadvantage on all saving throws while it is poisoned this way. This spell has no effect on constructs or creatures immune to the poisoned condition. A creature poisoned by this spell may make a constitution saving throw with a DC equal to 12 at the end of each of its turns to end the effect.

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the healing increases by 1d10 for each slot level above 1st, and the save DC increases by 1 for each slot level above the 1st. 

"Rot, and be renewed." 

- Alric Widobauk, Cleric of Montreal