Sickening Strike

Spell Lists: Artificer, Druid, Sorcerer, Warlock, Wizard
Evocation cantrip
Casting Time: 1 action
Range: Self
Components: S, M (a weapon worth at least 1 cp)
Duration: 1 round
You brandish the weapon used in the spell's casting and make a weapon attack with it against one creature within your reach. On a hit, the target suffers the weapon attack's normal effects, and is affected by a venom which damages it when near you. If the target ends its turn within 5 feet of you, it takes 1d10 poison damage.
This spell's damage increases when you reach certain levels. At 5th level, the melee attack deals an extra 1d10 poison damage to the target on a hit, and the damage the target takes for ending its turn near you increases to 2d10. Both damage rolls increase by 1d10 at 11th level (2d10 and 3d10) and again at 17th level (3d10 and 4d10).