You call out the name of an elder dragon of the type you want to cast and bring your hands to your mouth. Target can then exhale the breath weapon of the designated dragon type. Each creature in a 15-foot cone must make a Dexterity saving throw. A creature takes 3d6 damage (of corresponding type) on a failed save, or half as much damage on a successful one.

Fire Breath (Red / Gold / Brass) ignites any flammable objects in the area that aren't being worn or carried.

Lightning Breath (Blue / Bronze) can chain into anyone within 5 of the cone for 1d6 DEX save for half.

Acid Breath (Black / Copper) destroys any non-magical objects in the area that aren't being worn or carried. Sturdy items (i.e. metal, glass, crystal etc. are given a DEX save)

Cold Breath (White / Silver) Failed saves result in targets being frozen in place (restrained condition).

Poison Breath (Green) The cone forms into a cloud that takes 1d4-1 rounds to dissipate. Anyone entering the cloud, or in it at the beginning of their turn takes an additional 1d6 damage.

Target retains the ability as long as the caster maintains concentration, and it can be regenerated on the targets next turn on a roll of 5 or 6 on 1d6. 

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the damage increases by 1d6 for each slot level above 1st. (primary damage only)