Viper's Poison Slash

You release a wave of concentrated poison towards an enemy. Make a ranged spell attack against a creature within range, on a hit the target takes 1d10 poison damage and must succeed on a Constitution saving throw against your spell save DC. If the creature fails it can only regain half the amount of hit points when it heals until the start of your next turn. If the creature is immune to poison or the poison condition, it automatically succeeds the save.

This spell's damage increases by 1d8 when you reach 5th level (2d10), 11th level (3d10), and 17th level (4d10).