Chromatic Claw

You conjure a set of clawed talons on your free hand. The talons are similar in size to a gauntlet, shaped like a dragon's claws, and they last for the duration. They count as a simple melee weapon with which you are proficient. You choose acid, cold, fire, lightning or poison for the type of claws you conjure. They deal 3d6 of the chosen damage type on a hit and has the arcane, finesse, and light properties. If the target is missing any of its hit points, you make the attack roll with advantage.

You may dispel the claws at will, no action required. While the spell lasts you can conjure the claws again as a bonus action. 

At Higher Levels. When you cast this spell using a 3rd- or 4th-level spell slot, the damage increases to 3d8. When you cast it using a 5th- or 6th-level spell slot, the damage increases to 4d8. When you cast it using a spell slot of 7th level or higher, the damage increases to 5d8.