Prep your glass by running the orange rind along the rim to release oils and aroma.
Add blackberries and cinnamon to the desired glass. Use a muddler to crush ingredients together. Add ice to about mid glass.
Add simple syrup, pomegranate juice, vodka, ice, and bitters to your cocktail shaker. Shake until well combined. Pour into glass with ice and muddled ingredients. Add a splash of sparkling water, and give a quick stir.
Garnish with a sprig of fresh rosemary, and one or two blackberries.
For an extra spooky touch, light the tips of the rosemary on fire for a smoky effect.