Drain magic

You hurl a purple globe of energy at your opponent, damaging their connection to the Weave. Make a ranged spell attack. On a hit the target loses a spell slot equal to or lower than the level you cast this spell at. If the target doesn't have that spell slot, it takes 1d8 psychic damage. 

At higher levels. When you cast the spell using a spell slot of 2nd level or higher, the psychic damage taken increases by 1d8 per level above 1st.