To assemble:
On a cake platter, lay one layer of chocolate cake, top with the cheesecake. Then add the other layer of chocolate cake. Spread frosting over entire cake, sides and top.
Refrigerate frosted cake while you prepare the chocolate ganache.
For the ganache:
In a microwave safe bowl, combine dark chocolate with heavy cream. Heat 30 seconds. Stir and heat an additional 30 seconds. Whisk for several minutes until smooth. Allow to cool slightly.
Once cooled. Spread over top of chilled cake. Drizzle with remaining 2 Tbsp of caramel sauce and sprinkle with a pinch of kosher salt. Refrigerate cake until ready to serve!