Years of practice and sword play have made you a master of the blades. 

You can use any sword to destroy your enemy. 

--Sword Rage

At 3rd level,While raging, you gain the following bonuses:

-For the duration of your rage, you can make a single melee weapon attack as a bonus action on each of your turns, only with swords.
-When you hit an enemy with an opportunity attack, the target must succeed on a DC 15 Strength saving throw or be knocked prone.

==The Savage Sword of*

At 3rd level, you wield your trusty sword that is used not only to kill enemies, but to kill them in an gruesome ways. You can attune a Sword, whether non-magical or magical, in order for it to becomes the "The sword of (name)". You can only have one sword attuned at a time.  You gain an extra 1d4 slashing damage when wielding The Sword *. Upon attacking an opponent that is knocked prone, your attack gains extra damage equal to 1d6 + half your barbarian level.

==Secret of Steel

At 6th level, Your attacks have become more devastating add 16d damage.
Ending a creatures life gives you the sudden rush of adrenaline and rejuvenation to continue on with the fight. Whenever you kill an enemy while raging, you regain hit point equal to 1d6 + your constitution modifier.

==Decapitation

Beginning at 10th level, the sight of you killing will cause fear in those around you. When you reduce an enemy's health to zero with your weapon, you will immediately behead that enemy and let it's body fall to the ground headless. Enemies that are within 20 feet of you must must succeed on a Wisdom saving throw (DC equal to 10 + your proficiency bonus + your Charisma modifier) or become frightened of you for two rounds. This effect ends if the creature ends its turn out of line of sight or more than 60 feet away from you.

==Cleave

At 15th level, you can now muster the strength to make a fury of long, heavy swings against your foes like a pendulum. As an action, you can make  four, powerful strikes against a single target or multiple enemies that is within 5'ft of you. Once used, you need to finish a long rest to use again.