Sword of Fate

Choose a creature that you can see. You create an
illusionary sword that hangs above that creature's head.
Everyone with line of sight can see the sword except for
the affected creature. When you cast the spell you must
shout out one of the following conditions:
• You cannot harm us. The target creature breaks this
condition if they target the spell caster or a companion with an attack or a spell that causes damage.
• You cannot use magic. The target creature breaks this
condition if they cast a spell.
• You cannot leave this area. The target creature breaks
this condition if it moves more than 30 feet from the
spot it was standing when the spell was cast.
If the target creature breaks the condition, it takes
10d8 slashing damage as the blade becomes real and
slices downward. If the target is reduced to 0 hit points,
then one of its heads is removed. If the creature has no
remaining heads, then it is instantly killed.
The sword of fate can be dispelled. In addition, remove
curse will end the spell on the target.