The package of cake mix should include separate envelopes: cake mix, macaroon mixture, and glaze mix.
Combine cake mix, 1 1/4 cups water, butter, and eggs in a large mixing bowl; beat 2 minutes at highest speed of an electric mixer.
Stir in marshmallows, pecans and 1/2 cup chocolate morsels.
Spoon batter into a greased and floured 10-inch Bundt pan or tube pan.
Combine macaroon mix, 1/3 cup water, and remaining chocolate morsels; mix well.
Spoon over chocolate batter without touching sides of pan.
Bake at 350° for 40 to 45 minutes or until a wooden pick inserted in center comes out clean.
Cool 25 minutes; remove from pan, and cool on a wire rack.
Combine glaze mix and 1 tablespoon plus 1 teaspoon water; mix until smooth.
Spoon over cake.