diabolic- of, relating to, or proceeding from the devil; satanic; befitting a devil; extremely cruel or wicked; fiendish; very difficult or unpleasant
C14 from Latin diabolicus, from Greek diabolikos, from diabolos- devil
also diabolical
Recently I discovered that to preserve their diabolic power, vampires must sleep during the day in the same unhallowed ground in which they had been buried.
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