Shield Master

Proficient in shields, you unlock their full potential both in offense and defense.

Shields as Weapon

Starting at level 3, your training with shields allows you to use them as weapons.

A One handed shield deals 1d8 damage and a two handed shield deals 1d10 damage, you add your Strength modifier and proficiency bonus to your attack and damage rolls with shields.

You can improvise objects (such as doors, tables etc.) as makeshift shields. Improvised shields deal 1d4 damage and give +1 to your AC.

Stunning Shield

Starting at level 3 you learn to stun creatures using your shield. On your turn, you can use one of your attacks on your attack action to stun a creature within 5ft of you it must suceed a  Constitution saving throwm, the DC equals 8 + your proficiency bonus + your strength modifier. A creature that fails the saving throw is stunned until the start of their next turn.
You can use this feature a number of times equal to your proficiency bonus and you regain all expended uses once you finish a long rest.

Guardian Presence

Starting at level 7, your presence demands respect and fear from your foes. 

When a creature attempts to target an allied creature within 15ft of you with an attack, you can use your reaction and force that creature to make a Charisma saving throw. The DC is equal to 8 + proficiency bonus + your strength modifier. On a failed save, the creature attack targets you instead, having desadvantage on its attack. 

At 15th level, the area increases from 15 to 30 ft.

Heavy and Strong.

Starting at 10th level, while you are wielding a shield, you can add your Strength modifier to any Dexterity or Constitution saving throw you make.

Master of Protection

Your heavy Presence alone, disturbs your enemies, making it harder to focus them on allies
Starting at 15th level, any alie whithin 10ft of you gains the benefits of being in half cover and you gain an extra +1 AC if you have at least one alie whithin 10ft of you.

Paragon of Protection

At 18th level, When an attack or a spell targets a creature whithin 30ft of you, or an Area of Effect spell would affect at least one allied creature within 30ft of you, you can spend half of your current hit points to make the attacks miss or the spells to fail, this protective stance last until the end of the creature that attack you or one of your alies turn. You can use this feature once per long rest.