Challenger

A Challenger is someone that, by its nature or character, both invokes and answers to the call to battle.  A fighter willing to immortalize their love of battle begin down the path to becoming a Challenger.  Forged only through rigorous training and intense combat, Challengers are a forced to be reckoned with.  They specialize in melee combat, honing their speed and strength  to the the upmost limits in order to maximize their offensive and defensive capabilities.  Eager to test and prove their skills in combat, they hold a mentality that leaves very little room for failure.  In a life dedicated to challenging adversity through combat; You must rise above, falling wayside is no longer an option.

Refined Combat Effectiveness

Starting at 3rd level, you gain 3 Superior Reflexes.  At levels 7, 10, 15 and 18 you gain an additional Superior Reflex, totaling 4|5|6|7 respectively. You regain all Superior Reflexes after a long rest. 

Whilst wielding a shield and a melee weapon, you may use your action to ready a defensive stance in-order to perform special reactions.  While in a defensive stance, you are considered behind 1/2 cover against ranged attacks.

• Deflect: When a creature makes a successful melee attack against you, you may expend a Superior Reflex to Deflect the brunt of an attack. When you do so, the damage you take from the attack is reduced by half. 
• Perfect Block: Alternatively you may expend 2 Superior Reflexes to perform a Perfect Block which negates all damage from a single attack.

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  Riposte: When a creature fails a melee attack against you, you may expend a Superior Reflex to Riposte against a failed melee attack. Allowing you to make a melee weapon attack against the attacking creature.
• Devastating Counter: Alternatively,  you may expend 2 Superior Reflexes against the failed melee attack to perform a Devastating Counter, which allows you to make two melee attacks against the attacking creature.

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  Tank: When you enter a defensive stance you may immediate expend 3 Superior Reflexes to prepare to Tank, causing attack rolls against you to be at disadvantage. This effect lasts until the beginning of your next turn or ends if you are forced from a defensive stance (such as being grappled, knocked prone, disarmed of weapon/shield, etc.).
• Retaliate: When you enter a defensive stance you may immediately expend 3 Superior Reflexes to prepare to Retaliate, whenever you are hit by a successful attack you may immediately make a melee attack against that attacking creature.  This effect is not limited to one attack or attacker. This effect lasts until the beginning of your next turn or ends if you are forced from a defensive stance (such as being grappled, knocked prone, disarmed of weapon/shield, etc.)

Additionally, when you utilize either Tank or Retaliate, as a bonus action you may attempt to provoke all creature that can see or hear you within 15 feet to challenge your defense.  Creatures in range must make a DC Wisdom saving throw. A failure will result in the creature being provoked, thus compelled to approach & attack you, which lasts until the beginning of your next turn.  The taunted creature must make another DC wisdom saving throw at the beginning of its turn to attempt to break the provocation.  If a creature is provoked, any attack it makes against any other creature besides you is at a disadvantage.

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Speed, Strength and Endurance

At level 7, you begin to push you own physical limits, gaining the following benefits.

• Gain 10 feet of bonus movement.
• Gain advantage on physical skill checks and saving throws (Athletics, Acrobatics, Strength, Dexterity, etc.). Limited to 2 skill checks and 1 saving throw.
• When you use Second Wind, you regain (1d4) Superior Reflexes. Limited to two times per long rest.

Press the Attack

At level 10, you achieve an almost unmatched ferocity for cutting down your foes, upon reducing a creature's hitpoints to 0 or landing a critical strike your next attack deals an additional (1d10+ [1/2 fighter level]) weapon damage.

Additionally, as a bonus action you may expend a Superior Reflex to perform an Quick Attack.

Unstoppable

At 15th level, your sheer willpower combined with your physical might becomes a legendary force.  If you provoke an opportunity attack, as a bonus action you may attempt to shove the attacking creature(Athletics contest), it must succeed a Strength/Dexterity Saving Throw or be knocked prone/pushed back 5 feet away from you.

Relentless and Unforgiving

At level 18, you've maximized the effectiveness of your assault and are physically unmatched on the battlefield. When you Action Surge you temporarily use both Strength and Dexterity for your attack & damage modifiers with a melee weapon and gain a +1 AC bonus, which lasts until the beginning of your next turn.