Knight

Unlike its normal tanky counterpart, this fighter is quick and hard to hit, with mediocre damage and high AC, this fighter can distract the enemies for a long time while the rest of the party does whatever it wants.

Shield of Undeath

You create a shield of your life force. A field of death that repels projectiles, and grants resistances to physical attacks. You only may use this ability if you are using a weapon one handed. You conjure a red shield that has temporary hit points of half your maximum hit points. If the shield takes close range physical damage, you take half that damage, and the shield takes all the damage. If a projectile hits the shield, it takes all the damage. If it is hit by a magical attack, the shield takes twice as much as damage and you take no damage. When the shield is dispersed (takes enough damage to be destroyed) it deals 2d6 damage to the person who is carrying it. If you attempt to give someone else the shield will immediately disperse the shield.

Blood-crazed Rampage

If an enemy drops below 0 hit points due to one of your attacks, you may take another attack on an enemy within 10 feet. If you attack another enemy within range, you have advantage on attack rolls made against them. If you hit them, the amount of life the previous target is at, e.g. -10, add that much to the next attacks damage. If you kill the next enemy, you may add that much more damage to your next damage roll.

Soul of the Blade

At the beginning of your turn, you may imbue your blade with the power of the soul, your sword turns crimson red, and has a slight glow. While your weapon is buffed like such, whenever you deal damage to an enemy, you store that damage in the blade, and on a miss, you may instead deal that much damage. This damage stored in the blade dissipates when you miss an attack. If you miss an attack while the blade is not buffed, the blade does 5 damage to you, and the glow fades away a little bit more.

sacrifice of blood

As a bonus action, you may deal 3 damage to yourself to add 1d4 to any attack roll you make. If you use this ability while you are at 3 hp or below, you will deal an extra 1d6 damage, to your damage roll, and then fall unconscious. (you will stay conscious for the duration of the attack.)

nimble escape

When you are hit by any enemy, you may expend a hit dice to reduce the amount of damage by that much. If you die even though you used a hit dice, you take the value you rolled in damage. For example, if you are at 5 Hp, and an enemy hits you for 10, you use a hit dice to mitigate the damage. Lets say you rolled a 1, so the enemy does 9 damage to you. You would go to -1 because that's what you rolled on your hit dice.