Envenomed Strike

When you cast this spell coat a magical venom on the material component, then you make a melee spell attack against a creature within 5ft. On a hit deal 1d6 piercing damage. The creature then makes a Constitution saving throw.. On a failure they are inflicted with a painful haemorrhaging venom. It deals 2d6 poison damage and the creature is poisoned. The creature makes a Constitution saving throw at the start of their turn if they are poisoned by this spell. If the creature fails it takes 1d6 poison damage and 1d6 piercing damage. On a success they take half as much damage. If the poison lasts two or more additional rounds from when it was first poisoned the creature lasts for the full duration, no longer requiring concentration. The effect of the spell ends automatically if the caster loses concentration before this time. 

At Higher Levels. When you cast this spell using a spell slot of 3rd Level or higher, the piercing damage and poison damage when the creature is under the effect of the poison both increase by 1d6 for each slot Level above 2nd.