Earth Shock

1st-level Evocation
Casting Time: 1 reaction
Range: 60 feet
Components: VS
Duration: Instantaneous

You call upon the spirit of earth to strike your enemy instantly and attempt to disrupt their spells. The target must succeed on a Constitution saving throw or take 2d4 bludgeoning damage and get disadvantage on any concentration checks provoked by the spell, or half as much damage on a successful one.
This spell can be cast as someone else you can see is casting a spell. If they fail the saving throw against this spell, the target must make a concentration check to finish the spell. If they fail, the spell is lost.
At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the damage increases by 1d4 for each slot level above 1st.

Source: Homebrew