Venom Spike

You create and launch a putrescent missile at a creature within range. Make a ranged spell attack against the target. On a hit, the target takes 1D8 poison damage. If you roll a 7 or 8 on at least one of the damage die of this spell, the target is also poisoned until the end of its next turn. 

This spells damage increases by 1D8 when you reach 5th level(2D8), 11th level (3D8), and 17th level (4D8).