Melt chcolate candy melts to the package directions in the microwave.
Add chocolate candy melts to the dome mold and spread with the back of a spoon. Do this in one thin layer to coat then place in freezer for 10 minutes.
Take it back out and coat only where you can see through the mold. If you cannot see through the mold you do not need to add more. You want the bomb to stay together but not be too thick.
If you add more to the see through spots then place back in the freezer for another 10 minutes. Remove and slowly pop out the each side of the bombs. Place on a plate.
Heat a frying pan to low heat. Place one side of the bomb rim down onto the frying pan. This will lightly melt and even out the edges. Quickly add about 2 tablespoons cocoa mix to the bomb and marshmallows.
Melt the other side of the bombs rim and then place evenly with the other side. This will seal them together evenly. Do not add hot chocolate to the outside as it will just melt the bomb.
Using the excess candy melts. Dip a brush into the the chocolate and add some to the back of the eyes. Place the eyes on the hot chocolate bomb. This will act as a glue.
Do this for the M&M as well for the nose. Clip off a piece of each of the pretzels.
Use the chocolate to glue them to the top of the ball. You may need to hold it to the ball for about a minute. Let dry. Remove antlers and eat before doing the next step. Serve in a cup and pour over hot milk to dissolve the bomb and stir well.