Power Attack (Alternate)

On your turn, before making any attack rolls with a melee weapon that you are proficient with, you may choose to forgo your proficiency bonus. Thereafter, upon hitting a target, you deal additional damage equal to two times your proficiency bonus. The penalty to attack rolls and bonus to damage rolls continue to apply until the beginning of your next turn.

For example, a character with a proficiency bonus of +2 could, on their turn, forgo that bonus for their melee attacks, gaining a bonus to damage equal to +4.