I have removed the damage bonuses from Great Weapon Master (GWM) and Sharpshooter (SS). Instead those have been modified, and their damage bonus has been replaced by a universal "Power Attack" that any character can use, without a feat.

When making an attack roll, a creature can make instead a "Power Attack" By subtracting your proficiency bonus from your attack roll, you add double your proficiency to the damage if you hit. A power attack can be used once per turn.

 You Perform either a Standing or Running High Jump. If you move at least 10 feet prior, you jump 3 feet + Strength modifier, otherwise you only clear half the distance. Regardless each foot jumped uses 1 foot of movement. 

At the apex of your jump, you may perform a single attack on a target within your reach. If you can perform multiple attacks, each attack requires you to perform a jump.

If you fall at least 30 feet onto a creature, you may make a special Plunging attack. To perform a plunging attack, you must have Inspiration, or Spend a Hero or Villain Point to perform the attack.

 

Make a single weapon attack against the target; On a success, the creature takes the weapon's damage roll, half the fall damage as the weapon's damage type.

On a failed attack, the attacker takes the full damage from the fall. 

 

 

 

Example:

A Successful plunging attack from 50 feet with a Greataxe would incur half of 5d6 fall damage as slashing damage to the enemy. The attacker would take the remaining damage as bludgeoning damage.

 

Monk's Slow Fall: Reduces the Damage Prior to the attack. Reduces damage for attacker and victim.

Feather Fall: Reduces all Fall Damage. Reduces Fall speed. Reduces non-attack damage to 0 for attacker and victim

Barbarian Rage: Reduces damage as normal after the plunging attack.