Knight

You trained to fight to protect people 

Greater Armor

Beginning when you choose this archetype at 3rd level, you get a +1 to your AC when wearing heavy armor

Take the hit

Starting at 7th level, you can take a attack directed at a creature within 10 feet of you

At level 12 the rang is 15 feet, at level 17 the rang is 20 feet

Additional Fighting Style

At 10th level, you can choose a second option from the Fighting Style class feature.

Archery

You gain a +2 bonus to attack rolls you make with ranged weapons.

Defense

While you are wearing armor, you gain a +1 bonus to AC.

Dueling

When you are wielding a melee weapon in one hand and no other weapons, you gain a +2 bonus to damage rolls with that weapon.

Great Weapon Fighting

When you roll a 1 or 2 on a damage die for an attack you make with a melee weapon that you are wielding with two hands, you can reroll the die and must use the new roll, even if the new roll is a 1 or a 2. The weapon must have the two-handed or versatile property for you to gain this benefit.

Protection

When a creature you can see attacks a target other than you that is within 5 feet of you, you can use your reaction to impose disadvantage on the attack roll. You must be wielding a shield.

Two-Weapon Fighting

When you engage in two-weapon fighting, you can add your ability modifier to the damage of the second attack.

Unbreakable

Starting at 15th level, all damage dealt to you is lowered by your constitution score

Magic Resistance

At 18th level, you have advantage on saving throws against spells and other magic effects