Drain Vitality

You target a creature within range, forcing it to make a Constitution saving throw; undead creatures can make this saving throw with advantage, while constructs automatically succeed.  On a failed save, the creature has one of its following ability scores decreased by 2: Strength, Dexterity, or Constitution.  This ability score stays decreased for the duration of the spell.  An affected creature can repeat its saving throw at the start of its turns, ending this spell on a successful save.

This cantrip becomes more powerful when you reach higher levels, reducing a selected ability score by 2 more when you reach 5th (-4), 11th (-6), and 17th (-8) level.