Caustic Blood

Casting Time: 1 reaction, which you take in response to being damaged by a creature with either piercing or slashing damage 

You infuse your blood with caustic acid.  Until the start of your next turn, when you take piercing or slashing damage, a spray of acidic blood bursts from the wound, including from the triggering response.  One creature in a 10-foot cone must make a Dexterity saving throw.  A creature takes 1d10 acid damage on a failed save, or half as much damage on a successful one.  The acid destroys any susceptible objects in the area that are not worn or carried.

 At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the damage increases by 1d10 for each slot level above 1st.