Line a large, rimmed baking sheet with parchment paper.
Melt 8 ounces of the chocolate chips with 1 teaspoon of shortening in the microwave (on low heat, stirring every 15 seconds) until smooth. Spread the chocolate evenly over the parchment, to form a rough 10 x 15 rectangle. Immediately add the pretzel twists over the top. (pretzels will overlap) and gently press them into the chocolate.
Add caramels to a microwave safe bowl with 2 tablespoons water and melt according to package instructions (on high for 2 minutes). Stir well and drizzle the melted caramel over the top of all of the pretzels.
Melt remaining 4 ounces of chocolate with remaining 1/2 teaspoon shortening and drizzle over the caramel. Sprinkle with sea salt.
Refrigerate until hardened, 30 - 60 minutes. Peel chocolate away from the parchment paper and cut into bars
Store leftovers in covered container in refrigerator for up to 1 week.
Note - I used butter flavored vegetable shortening as the shortening for this recipe. Any hard shortening like butter or margarine will work well.For variation - sprinkle toffee or peanut butter bits over the chocolate before the sea salt!