Southclaw's Wrath

You are one of the aspects of the 5-headed dragon god Tiamat, reborn. When battle closes in around you, the dragon within erupts in defense of what you claim as yours.

When you take the Attack action, you can choose one of your melee attacks to awaken your draconic fury. On a hit, after your weapon connects, you exhale a jet of acid, fire, lightning, poison, or cold breath (type depending on the aspect of Tiamat chosen on feat selection) toward another creature within 5 feet of your original target.

That creature must make a saving throw (type situational depending on breath, DC = 8 + your Proficiency Bonus + your Constitution modifier). On a failed save, it takes 1d8 elemental damage, or half as much on a success. The damage increases to 2d8 at 5th level and 3d8 at 11th level, and 4d8 at 17th level. 

You can use this feature a once per round up to a number of times equal to your Proficiency modifier, and you regain all expended uses when you finish a long rest.

This attack does not count as casting a spell and may be used while Raging.