Corruption

This curse has two forms. The first you corrupt the mind of a target. If they fail a Wis save they are at disadvantage on saves vs. Int, Wis Cha saving throws for 1 minute or 10 turns.

The second causes damage. The victims mind is corrupted with psychic mental damage. The victim takes no damage for 2 turns. On the 3rd turn they take 10d8 + spell casting bonus. During the spells duration of 3 turns the victim is at disadvantage on all attacks. To avoid they must pass a Wis save but will still take half dmg.