Crusher

You developed your arms and upper body strength to the extreme. Specialised  in killing , brutally and quickly.

Powerful Wielder

Beginning when you choose this archetype at 3rd level, you can wield Two-Handed weapons with only one hand but if you choose to hold it with two hands instead you can get a +2 to attack rolls and always take average damage rounded up. 

No Time to Miss

Starting at 7th level, instead of using your extra attack you may choose to attack once with advantage and multiply the damage by the number of extra attacks you are forgoing, this effect scales when you gain extra attacks at 11th and 20th level. Also you gain advantage on attacks against targets with less than 11 DEX (10 + half your proficiency rounded down), this scales with your proficiency at 9th level with advantage on creatures with less than 12 DEX, and at 20th level at 13.

Overpowering Strikes

At 18th level, your blows are so powerful that they can overcome resistances dealing normal damage and immunities dealing half of the damage, unless the resistance and immunity are due to a physical effect like gaseous form in which case this effect does not apply.  When you make a melee attack you gain the following benefits based on how much your attack roll exceeded the creature AC : 

• 5 or more, you deal an extra 10 damage to the target.
• 10 or more, you can choose to amputate a limb of the creature or stun it.
• 15 or more, the hit is critical, and if it deals more than half of the target current hit points it instantly drops to 0 instead.

You are coming down with me

Starting at 15th level, when a creature is attacking you with a melee attack you may expend your action surge and choose to let yourself being hit, the creature still rolls to attack, if it misses consider it as a hit, and if it would hit you take critical damage instead, if the attack was a critical hit it is still considered as a critical, then you can make an opportunity attack against the target and consider your dice roll as a natural 20, then add the damage that you took to the damage dealt to the creature.

Offense is the best Defense

 At 10th level, you gain a +2 bonus to AC while wielding a heavy weapon and +3 if you are wielding 2 heavy weapons. When a creature is attacking a target within your reach, including yourself, you can use your reaction to make an opportunity attack against that creature, if you hit the creature must make a Dexterity saving throw with DC equal to your Strength score, on a fail the creature cannot complete it's attack.