Desperate measures

As a last measure, you draw your own life force to harm your foe. As the arcane words leave your mouth, your life force concentrates in your hands. You take 4d10 necrotic damage and make a melee spell attack to deal the same damage +10 to your opponent.

 If this spell is used and you don't go unconscious taking the damage your character ages 1d4 years.

At higher levels. When you cast this spell using a spell slot of 3rd level or higher, the damage increases by 5 for each slot level above 2st.