Defensive Style, Medium Armor (Combat)Modifier
In some ways, this type of fighter gains the best of both worlds, receiving the superior protection of their armor and gradually learning to treat it as a second skin. Although their armor is too restrictive to make rapid assaults, the fighter can use it to protect himself well.
Benefit: You gain proficiency with light and medium armor and shields (other than tower shields). You may sleep in medium armor without penalty and ignore any movement penalty imposed by medium armor. you gain damage reduction 1/- while wearing medium or heavy armor. Lastly, you may prevent all hit point damage you would take from any source as an immediate action once per day unless the damage would be enough to kill you.
At 5th level and every 4 levels afterwards, reduce the armor check penalty of medium and light armor you wear by 1 and increase the maximum Dexterity bonus of such armor by +1. For each point by which your armor’s armor check penalty would be reduced below 0, instead increase its armor bonus by +1. Furthermore, increase the value of your damage reduction by +1. Lastly, you may prevent all damage to yourself one additional time per day.
Essentia: Your Damage Reduction increase by +1 / Essentia