Touch of Corruption

You create an inky black, clawed hand in the space of a creature within range. Make a ranged spell attack against the creature to slash at the target. On a hit, the target takes 3d6 necrotic damage and the target must make a CON save against your spell DC. If the target fails, they are poisoned for 1 round. If using corruption rules, if the target rolls a natural 1 on this save they gain a tier of corruption. This can never raise corruption beyond tier 1.

At Higher Levels. When cast at higher spell levels, increase the damage by 1d6 and the natural roll required to contract corruption increases by 1. (A natural 3 on a 3rd level cast would cause corruption) At 3rd, 5th, and 7th spell level the maximum tier of corruption caused goes up by 1 as well- however only a natural 1 will increase corruption beyond tier 1 with this spell.