Wolfsbane (Aconite: aconitum napellus)
This herb is extremely unpredictable, and it’s impacts change significantly from harvest to harvest. This is a classic ingredient in flying ointments, and can be quite deadly. Hecate poisoned her father with Aconite. This herb will get the heart beating again after a heart attack, but the dose needs to be extremely small: a swipe of the dried root across the tongue will do.