Superior fighting skills

Your temporary hit point increases by an amount equal to three times your level when you gain this feat as long as you are wearing armor. Whenever you gain a level thereafter, your temporary hit points increases by an additional 3 hit points.

You learn two maneuvers of your choice from among those available to the Battle Master archetype in the fighter class. If a maneuver you use requires your target to make a saving throw to resist the maneuver's effects, the saving throw DC equals 8 + your proficiency bonus + your Strength or Dexterity modifier (your choice).You gain two superiority dice, which follows the normal level progression ( These dice are added to any superiority dice you have from another source). These dice are used to fuel your maneuvers. A superiority die is expended when you use it. You regain your expended superiority dice when you finish a short or long rest.

You gain +5 to ac as long as you are wearing Armor 

While wearing armor if a source would have you make a saving throw to take half damage on a successful save you now take 0 damage on a successful save and half damage on a failed save.

Choose an additional fighting style from the fighter class list you may not take one you already have