Von Brooke's Brilliant Bolt

As part of a ranged weapon attack, the arrow or bolt gains a green and purple radiance. On a hit, the target must make a Constitution saving throw, or take 2d10 poison and 2d10 psychic damage and become blinded and poisoned for the duration. On a success, the target takes half damage and does not suffer the effects.

The target can make a saving throw at the end of each of its turns to end the conditions.