1. get bonnie
2. link the vampires who wants to be human again
3. get one of them to drink it
4. whatever happens to one happens to all
P.S. its just a theory i apologise if its stupid/have been done before
Holes in the plan:
The Binding Spell requires the blood of a human doppleganger and the cure.
Currently we have no cure. If Katherine did not take the cure, we would have no human doppleganger.
What do you think?