Chimeric Growth

The oversized neck and head of a chromatic dragon rapidly grows out from your shoulder and back for 1 Hour. The color of the dragon is determined at casting. Red associates with fire, blue with electricity, white with cold, black with acid, green with poison.
As a bonus action, the dragon head may Bite. Melee Weapon Attack: + (8 + your proficiency bonus) to hit, reach 10 ft., one target. Hit: 13 (1d10 + 8) piercing damage plus 3 (1d6) of the corresponding elemental damage.

Additionally, as an action, the dragon head may exhale a 30-ft. cone of corresponding elemental damage. Each creature in the area must make a Dexterity saving throw vurses your Spell save DC taking 9d6 damage on a failed saving throw, or half as much damage on a successful one. After using the breath weapon the dragon head retracts back into your body and the spell ends.