This a chocolate filled with caramel and topped with sea salt. It is made by the new chocolate shop Chocolate Fox Chocolatier located in the tiny space next to HUB Restaurant and Ice Creamery at 266 E. Congress St. The shop does not have a retail space but you can buy the chocolates at a small display next to the cash register at HUB.
Seriously, this is the best chocolate I've ever bitten into. It made my ears ring and the hair on my neck stand up. That is all.