Arcane Corruption

You corrupt a creature with arcane energy. Make a ranged spell attack against the target. On a hit the target takes 1d6 force damage and one of the following effects takes place:

If the target has the ability to cast spells, for the duration of the spell the target loses the ability to cast spells and the target becomes immune to any spell that would harm it.

If the target doesn't have the ability to cast spells, for the duration of the spell the target 2d6 force damage at the start of your turn.