Base Class: Fighter
The archetype of the Bloody Demon, employ their own flesh and blood in the slaughter of enemies. To a Bloody Demon, the thrill of battle and hunting is everything. It isn't about winning or losing, it's for the opportunity of a good fight. When they find that fight, they use everything at their disposal to contest the opponent, utilizing blood sacrifices to grant themselves offensive and defensive capabilities though at a steep price.
Blood Price
Beginning when you choose this archetype at 3rd level, you gain the ability to utilize your blood to enhance attacks and defences. You gain the following features; Sanguine Slice and Sanguine Shield.
Sanguine Slice. Whenever you hit with an attack, you may sacrifice a number of hit points and add the amount sacrificed to the attack damage roll. The number of hit points sacrificed cannot exceed triple your proficiency modifier.
Sanguine Shield. When another creature hits you with an attack, you may use your reaction and sacrifice a number of hit points, gaining +1 AC for every 3 hit points sacrificed. The number of hit points sacrificed cannot exceed triple your proficiency modifier.
You may only use each of these features once per turn.
Scent of Blood
Starting at 7th level, you gain advantage on any Wisdom (Perception) or Wisdom (Survival) check used to find a wounded creature.
Additionally, as a bonus action you can sacrifice 1 hit point to learn the general direction of every creature within 100 feet of you that has blood.
Blood Rush
At 10th level, you can use your bonus action to sacrifice a portion of your health and enter a Blood Rush. For every 2 hit points sacrificed, you gain the effects of a Haste spell on yourself for 1 round. This Haste effect cannot last longer than 1 minute total.
Strength of the Wounded
Starting at 15th level, you gain increased power when below half of your maximum health. Whenever you use your Sanguine Slice, or Sanguine Block features while below this threshold, you gain double the effects for each hit point sacrificed.
Vigor
At 18th level, your sacrifices only take away a portion of your power. Whenever you sacrifice a number of hit points, you gain an amount of temporary hit points equal to the hit points sacrificed. These temporary hit points last for up to 1 minute.