Beat butter and sugar until fluffy and creamed. Add eggs and whip. Mix cocoa and red food coloring separately and add to creamed mixture. Add vanilla, vinegar and buttermilk together in a glass. In a third bowl, sift and mix flour, baking soda and salt.
Begin adding flour to the batter, alternating with the buttermilk mixture, whisking just until incorporated. Mix until just combined, being careful not to overmix.
Pour batter into prepared pans. Bake in preheated oven until a tester inserted into the cake comes out clean, about 30 minutes. Out of the oven, cool ten minutes before removing from baking sheet. At this point, they should be covered and chilled until ready to assemble. When creating structural cakes, temperature is key and the colder everything is, the better!
CREAM CHEESE FROSTING:
Cream butter and cream cheese together in stand mixer. Once fluffy, add sugar a cup at a time and beat until airy. Add vanilla and salt and spread over cake and in between layers that require no structural support.
In a stand mixer, beat room temp butter until fluffy. Add icing sugar one cup at a time. Add whipping cream and salt (and add desired color for the heart section batch). Whip and frost cake.
Combine all ingredients in a bowl. Use for Lambeth-style decorating as well as webbing on the heart and teeth on the Demogorgon blossoms.
Warm corn syrup separately in the microwave. Melt down chocolate or candy melts. Once in a liquid state, remove from heat and mix in warm corn syrup, mixing just until a soft serve texture forms. Wrap tightly in plastic wrap and allow to set for 6-8 hours. When ready to use, break off a selected piece and manipulate in your hands until it is soft and flexible again. If it's too soft, you can always fold in a little powdered sugar to help it set up a bit more. Once you have a flexible dough you can roll it out to make the Demogorgon blossoms or sculpt the hand. .
Tip: I tripled this recipe for my 3-tiered cake. For the third batch, I poured the cake batter into a 6" pan and a 10" pan.