Shoot a green arrow that bursts in a spray of acid. Deals 4d4Acid damage immediately and 2d4Acid damage at the end of the target's next turn.
If the spell misses, the target still takes half the initial damage, but no damage at the end of its next turn.
If it is higher level than the spell slot you used to Counterspell, you must make a check using your spellcasting ability[See Notes] to prevent it. The check's difficult is equal to 10 plus the level of the spell you are trying to counter.