Toxic Grasp

Venom leaks from your hand to deliver a toxins to a creature you try to touch. Make a melee spell attack against the target. You have advantage on the attack roll if the target is poisoned. On a hit, the target takes 3d8 poison damage, and it must succeed in a CON saving throw of game 1d4 poison damage at the start of their turn

The spell's damage increases by 1d8 for each spell level above 1st