Tainting Touch

With a touch, you summon toxins directly inside a creature's body. Make a melee spell attack against the target. On a hit, the target takes 1d8 poison damage and another 1d4 poison damage at the start of their next turn. This spell's damage increases when you reach certain levels. The initial damage increases by 1d8 and the subsequent damage by 1d4 respectively when you reach 5th level (2d8 and 2d4), 11th level (3d8 and 3d4) and 17th level (4d8 and 4d4).