Brainshock

You wrack the mind of a target, causing the spell they may be concentrating on to falter and damage them.

You choose one creature within range that is currently concentrating on a spell and they are forced to make a Intelligence saving throw. On a failure, the target instantly looses concentration on the spell they were concentrating on and they take 1d10 psychic damage equal to the spell slot level used (i.e. 5d10 psychic damage if they were concentrating on a spell that used a 5th level spell slot). On a success, the target keeps concentration, but takes half damage.

 Finally, on a failure the target also looses the ability to cast the canceled spell for 1d6 rounds.