Antimagic Bullet

You fire a anti-magical bullet at a target within range. Make a ranged spell attack. On a successful hit the target takes 2d6 force damage and loses 1d4 levels worth of unused spell slots. For example you roll a four, you could remove 4 level 1 spell slots, 2 level 2 spell slots, a level 1 spell slot and a level 3 spell slot, or a level 4 spell slot. The target regains the lost spell slots after a long rest.

At Fifth level, spell slots removed becomes 1d4+1, at 10th 1d4+2 at 15th 1d4+3, at 20th 1d4+4.