Preheat oven to 350F. Bake chocolate cake mix according to directions on box. Allow to cool.
Cut each layer in half (Pull fishing line tight through for a clean, even cut).
Stir chocolate with water over low heat until melted. Beat into cream cheese with mixer. Beat in sugar and vanilla. Blend 1/3 of cream cheese chocolate mixture with 3-1/2 cups cool whip, reserve one cup for decoration. Fill layers and frost top and sides with remaining cream cheese chocolate frosting. If desired, sprinkle with chopped candied cherries over frosting. Store cake in refrigerator. Cake will freeze well.
Cajun Country -- New Iberia, Louisiana