Mind Numbing Arrow

You brandish the weapon used in the casting of this spell and make a ranged attack with it against one creature within the weapon's range. On a hit, the target suffers the weapon attack's normal effect and is injected with a psychedelic venom that lasts until the start of your next turn. If the target casts a spell before then, it takes 1d8 poison damage as the venom reacts to the magic. This effect is instantly triggered if the target is concentrating on a spell.

This spell's damage increases when you reach certain levels. At 5th level, the attack deals an extra 1d8 poison damage to the target on a hit, and the damage the target takes for casting increases to 2d8. Both damage rolls increase by 1d6 at 11th level (2d8 and 3d8) and again at 17th level (3d8 and 4d8).