Begin by lining an 18x13 inch sheet pan with parchment paper and place remaining prepped ingredients in an assembly line.
In a microwave safe bowl or atop a double boiler, melt semisweet chocolate until melted completely. If using a microwave, warm in 30 second intervals, stirring each time until completely melted.
Quickly pour melted chocolate atop parchment paper, smoothing uniformly to the edges and swirling in a decorative pattern.
Making sure to work quickly while chocolate is still melted, evenly disperse toppings atop beginning with pretzels, then marshmallows, followed by chocolate shards, dates, pistachios then sprinkles.
Gently push larger toppings down into chocolate.
Freeze sheet pan at least 1 hour to harden.
Cut bark into small squares and store chilled in an airtight container or mason jars.