Viperous Defense

You channel the ferocity of a vengeful viper through yourself. Until the start of your next next turn, you have advantage on Constitution saving throws and on attack rolls and whenever you hit with an unarmed strike or with a versatile and/or light weapon, the target must succeed on a Constitution saving throw, taking 2d6 poison damage on a failure, or half as much damage on a success.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the amount of poison damage increases by 1d6 for each spell slot above 2nd.