Brutality

You touch a willing creature. They are infused with raw, primal magics for the duration. As long as they under the effects of this spell, their critical hit range becomes 19-20

At Higher Levels: If cast at 7th level, their critical hit range becomes 18-20. If cast at 8th level, their critical hit range becomes 17-20. If cast at 9th level, their critical hit range becomes 16-20.