Defender

The defender can always be found in the thick of it working to take eyes off their more squishy companions. Drawling aggro and providing defensive support. 

Defender Lore

Gain expertise in one skill of your choice from athletics, acrobatics, or survival. 

Acrobatics Expertise

You have expertise in acrobatics skill checks.

Athletics Expertise

You have expertise in athletics skill checks.

Survival Expertise

You have expertise in survival skill checks.

Shield Projection

Starting at level 3 when you take this subclass as a bonus action while wielding a shield you are able to empower your allies with the strength of your shield granting them a +2 bonus to ac for an hour. This ability can be used a number of times equal to your constitution modifier (a minimum of once). You regain all expended uses when you finish a short or long rest. At 7th level each use can effect 2 targets, 3 targets at 10th and 4 targets at 15th.

Provoke

Starting at level 7 as an action you can let out a provoking shout, all hostile creatures in a 30 ft radius centered on you must make an intelligence saving throw or be forced to target only you for a duration equal to 1d4+(strength modifier) turns(minimum of one). Attempts to target other creatures than you result in 1d4 psychic damage and disadvantage on attack rolls. On a successful save a creature is immune to this effect for 24 hours. You can use this ability a number of times equal to half your fighter level rounded down. You regain all expended uses when you finish a short or long rest.

Save DC = 8+proficiency+strength modifier

Damage Dampening

Upon teaching level 10 the effectiveness of your defenses have seen noticeably growth displayed in 2 new abilities.

Perfect Reflexes- While you wield a shield you have resistance to bludgeoning, piercing and slashing damage from all sources.    
Devour- You can use your reaction to cast Absorb Elements at 1st level 10 times. You regain all expended uses when you finish a long rest.

Enhanced Provoking

Starting at level 15 your ability to demand enemies attention has reached new heights. When you expend a use of your provoke skill you gain temporary hit points equal to 5*the number of creatures affected + your constitution score. You also have advantage on melee attack rolls against provoked enemies

Big Defense Energy

When you reach level 18 your mastery of defensive combat is unmatched, as a result the AC bonus you receive from shields is doubled. Additionally, using your Shield Projection feature grants a +4 to AC instead of the normal +2 and Shield Projection now grants your fighter level of temporary hit points to affected creatures.