Creating the Decadent Blackberry Velvet Gothic Cake is a rewarding process. Follow these steps to ensure a successful bake:

1. Preheat the Oven: Preheat your oven to 350°F (175°C). Grease and flour two 9-inch round cake pans.
2. Mix Dry Ingredients: In a large bowl, sift together the flour, sugar, cocoa powder, baking powder, baking soda, and salt.
3. Combine Wet Ingredients: In a separate bowl, whisk together the buttermilk, vegetable oil, eggs, vanilla extract, and blackberry puree until well combined.
4. Combine Mixtures: Gradually add the wet ingredients to the dry ingredients, mixing until just combined.
5. Add Boiling Water: Carefully stir in the boiling water, which will thin the batter. This step is crucial for achieving the cake’s moist texture.
6. Divide Batter: Pour the batter evenly into the prepared cake pans.
7. Bake: Place the pans in the preheated oven and bake for 30-35 minutes, or until a toothpick inserted in the center comes out clean.
8. Cool: Once baked, remove the cakes from the oven and allow them to cool in the pans for 30 minutes. Then, transfer to wire racks to cool completely.
9. Prepare the Frosting: While the cake cools, beat the softened cream cheese and butter together until smooth. Gradually add the powdered sugar and mix until fluffy. Stir in the vanilla extract.
10. Assemble the Cake: Place one layer of the cooled cake on a serving platter. Spread a generous amount of cream cheese frosting on top. Add the second layer and frost the top and sides of the cake.
11. Garnish: Decorate with fresh blackberries and edible flowers, if desired.

These steps will guide you in crafting a truly exceptional cake that not only looks magnificent but also tastes incredible.