Countering spell

You attempt to interrupt a creature in the process of casting a spell. The creature makes a Constitution saving throw, on a fail the spell fails, it has no effect and the creature take 3d8 psychic damage. If the spell you are countering is at a higher level than the level you cast it, they get advantage on the save. If you cast Countering Spell higher than the creatures spell they have disadvantage on the save.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage is increased by 1d8 per level.