Dirty Priest's Dagger

Your faith allows you to summon a dangerous spectral dagger in your hand. As a part of your action, you go to stab the dagger into your target. Make a melee spell weapon attack using your spell casting modifier for the attack and damage rolls. On a hit, the target suffers 1d4 piercing damage and 1d4 acid damage. At the start of the target’s next turn, the dagger bursts into acid and explodes outwards. Each creature of your choice within 5ft of the target that is not the target must succeed on a dexterity saving throw or take 1d4 acid damage.

Each damage roll increases by 1d4 when you reach 5th level (2d4), 11th level (3d4), and 17th level (4d4).