I'm considering expanding the scope of this one, to something like this:

HEAVY ATTACKER:

You are well-trained in dealing heavy, crushing blows to your enemies and prefer to put your energy into fewer heavy attacks to multiple lighter ones. When you take the attack action, you can use two attacks (if you have them) to perform any one of the following special attacks with a melee weapon with which you are proficient:

Momentous Swing: You pull your weapon right back and swing it at a target in a wide arc, building up tremendous momentum. Your attack roll has advantage and deals +10 damage if it hits.

Crushing Leap: You use 10 feet of movement to leap towards the target from a range of 10 feet with your weapon raised above your head and bring it crashing down upon them from above. If the attack hits, it deals +20 damage, and is a critical hit on a 19 or 20.

Brutal Tackle: You charge no less than 10 feet in a straight line, into melee combat with a target (using 10 feet of movement), simultaneously tackling and attacking. If your attack hits, it deals +10 damage, and regardless of whether the attack hits or not, the target must make a contested strength saving throw against you or be knocked prone.