Prepare cake according to box instructions substituting 1/4 cup creme de menthe for 1/4 cup of the water.
Cool cake to room temperature. Heat fudge sauce to make it easier to spread on cake. Refrigerate cake to chill fudge.
Mix cool whip with 1/4 cup creme de menthe. Spread over fudge layer. Drizzle cake with Hershey's Magic Shell. Chill until ready to serve.
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