Force Guardian

While many fighters opt to hone their skills with the weapons they cherish and play as instruments of war, those who choose to walk the path of the Force Guardian usually find their shields to be their most valuable asset. The power of a forceful soul is great, and with it, the most vigilant of fighters can manifest it into an adamant forcefield. Like a walking tent of defense, force guardians have been held in high regard as saviors of entire regiments. Through a journey of battle, defense, and self-sacrifice, the greatest of Force Guardians become fortresses that many can rely on.

Guardian Shield

When you choose this archetype at 3rd level, the power of your forceful spirit manages to find its way into any shield you don, allowing you to manifest a forcefield around yourself with a 10 foot spherical radius, provided you have a shield in your hand. Creatures allied to you can walk through this force field. Creatures not allied to you cannot walk through it, and must break it to attack you or any creatures within. 

When you’re using a shield in one or two hands, you can use a bonus action to create your guardian forcefield, or to stow it and use your shield normally.

Your forcefield has temporary hit points equal to the cumulative average rolls of all your fighter hit dice, plus your fighter level and constitution modifier. Your shield breaks at 0 hit points.

(6*fighter level)+fighter level+CON mod

Your own hit dice will heal these temporary hit points as well when used during a short rest or when using your second wind ability, and your forcefield will fully restore itself over a long rest. These temporary hit points are shared among yourself, and any party members within the forcefield. The forcefield cannot be healed by any other means.

If your force field does not have 0 hit points and is deployed, it will always be considered the target when you or any allies within your forcefield are targeted for an attack. Any attacks that deal damage over an area of effect ignore this rule, but use the DC of the forcefield when rolling for damage. 

Creatures not allied to you within your forcefield will not receive the effects of it. 

Creatures allied to you within your shield are considered under half cover when using a ranged weapon. 

While you have your forcefield manifested, you cannot take the dodge action. The forcefield is immune to conditions, and transfers conditions to the Force Guardian wielding it.

Greater Guardian Shield

Starting at 7th level, becoming more attuned to your protective abilities allows for more utility to grace your forcefield. Your forcefield now has an armor class equivalent to half of yours, with a minimum armor class of 6, and a maximum armor class of 15. 

Your forcefield now has a maximum radius of 15 feet.

When your forcefield is targeted with a damaging attack that requires a saving throw, the save DC is compared to the forcefield's armor class. This does not apply to saving throws that have to do with conditions, and you will make those saving throws normally.

Supreme Guardian Shield

Starting at 10th level, your forcefield gains an unnaturally strong consistency, making it staggeringly durable. Your forcefield now has an Armor Class equivalent to your own, with a minimum of 12 and no maximum.

Shield Burst

Starting at 15th level, when hit by non-magical weapon attacks, your forcefield deals force damage equivalent to a quarter of the damage dealt to all creatures not allied to you, within 40 feet of you. Shield burst can be used five times every short or long rest.

Saving Field

Beginning at 18th level, your forcefield will stabilize unconscious creatures allied to you within on the start of your turn, and any creatures allied to you within 20 feet of you can move to an unoccupied space within 5 feet of you as a bonus action, hiding in the shield. Any creature allied to you is considered to be under three-quarters cover when within your forcefield. Your forcefield's maximum radius expands to 20 feet.