Preheat your oven to 350°F (175°C) and prepare two 8-inch cake pans by greasing them with cooking spray and lining the bottoms with parchment paper.

In a large mixing bowl, sift together 2 cups of all-purpose flour, ¾ cup of black cocoa powder, 2 cups of white granulated sugar, 1 ½ teaspoons of baking powder, 1 ½ teaspoons of baking soda, and 1 teaspoon of salt.

In a separate bowl, whisk together 1 cup of oil, 2 teaspoons of pure vanilla extract, 4 large eggs, 1 cup of melted Endangered Species chocolate, and 1 cup of buttermilk.

Gradually add the wet ingredients to the dry ingredients, stirring gently with a spatula until just combined.

Divide the batter evenly between the prepared cake pans and bake for 30-34 minutes, or until a toothpick inserted in the center comes out clean.

While the cakes cool, sift together 4 cups of powdered sugar and ½ cup of black cocoa powder in one bowl, then beat 1 cup of softened butter until creamy in another bowl.

Once the cake layers are cool, assemble by placing one layer on a serving plate, spreading frosting, and stacking the second layer.

Frost the entire cake, adding decorations like molded chocolate skulls or Halloween-themed treats.