Witchbane

You target a creature within range, it has to make an Intelligence saving throw, on a failed save the target is cursed for the spell's duration, anytime it casts a spell of its own it has to make a INT saving throw or take 2d8 psychic damage. On a succesfull save the creature takes 1d10 psychic damage. Affected creatures can make a WIS saving throw everytime they end their turn to attempt to resist the spells effect.

When cast using a higher level spell slot you can choose one additional target for each level above 2nd.