Corruption

Shoots a blast of pure corruption that corrupts the souls of any who are unable to resist. Each creature in a 20 foot cone must make a Wisdom saving throw.  On a failed save, the affected creature takes 3d8 psychic damage instantly and the target(s) become corrupted, continuing to take 3d8 psychic damage each round for the spell’s duration. At the start of your turn, you roll the damage dice for each creature you have afflicted with this spell.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d8 for each slot level above 3rd.