With the Kilkenny cats "Terrible Wounds" needs a way of getting rid of the penalty. Even "reduced by 1 for each full day that the character spends entirely at full hitpoints" would do if you want to make it pretty nasty. But I'm actually thinking that Heal or Regeneration should handle at least 1 point of it, if not all of it per casting.
Also, there is a difference of "and" vs "or" for Mr. Schrodinger You Are Now My _____ as to if you HAVE to go along for the ride, or CAN'T.