The faces of despair

You stare into your target's eyes and black tendrils shoot from you eyes into their's. Your target must make an intelligence saving throw, on a failure, the target is blinded and can only see devilish skulls screaming and circling around their head. They also take 6d6 necrotic damage at the start of each of their turns until the spell ends. The target may repeat the saving throw at the end of each of their turns.