Toxic Smite

As you hit the target, it takes an extra 1d8 Poison damage from the attack. At the start of each of its turns until the spell ends, the target is inflicted with the Poisoned Condition and then makes a Strength saving throw. On a failed save, the spell continues. On a successful save, the spell ends.

Using a Higher-Level Spell Slot. The initial damage increases by 1d8 for each spell slot level above 1.