For the mocha chocolate sauce: In a medium saucepot, heat the cream, coffee and corn syrup over low heat. Once hot, whisk in the chocolate and vanilla. Let simmer for 5 minutes.
For the dulce de leche sauce: In a small saucepot, whisk together the dulce de leche, heavy cream and spiced rum. Heat over low heat until hot.
To assemble the sundae: Pour about 2 tablespoon each of the mocha chocolate and dulce de leche sauces in the bottom of a sundae glass. Top with the coffee ice cream, vanilla ice cream and finally the chocolate ice cream. Drizzle with more of the sauces. Top with the whipped cream, garnish with the chocolate-covered pretzels, brittle and just a little drizzle of each of the sauces. Top with the chocolate-covered cherry and sprinkle with the edible gold sprinkles or glitter. Serve immediately.