The Daughter's Wroth

Pick a target within range and cast a hex on them.  When cast a tendril of shadow reaches across the space to the creature, when contact is meet the creature is subject to a fit of seizures should they fail a DC 18 Intellect save.  On a failed save the creature takes 2d12 damage each turn until no longer inflicted or until the effect has lasted three turns.  On a successful save the target takes half this damage for the same duration.  If a creature moves outside of the range or moves onto another plane the spell's effect ends.  

For each level cast at higher than 3 add 1d4 damage to either a successful or failed save.