Hemophage

Whether it be the consequence of your birth, vampirism, or a curse placed upon - you have found yourself able to manipulate blood. Hemophage fighters combine their powers over blood with their own martial prowess to enhance their own vitality, rally allies in the heat of battle, or hamper their enemies. 

Bloodweaving

As a Hemophage, you are able to use your own vitality in a number of ways. You learn a number of Blood Arts that are fueled by your own Hit Points.

 

Blood Arts: Starting at level 3, you learn three Blood Arts of your choice from the Arts Options later in this subclass’s description. Most arts require a hit point cost – when you use those arts, you lose hit points equal to the amount specified. Many arts enhance an attack in some way – you can only use one art per attack.

You learn two additional arts of your choice when you reach Fighter levels 7, 10 and 15. Each time you learn new arts, you can also replace one art you know with a different one.

Saving Throws: If an Art requires a saving throw, use the following:

 Blood Art Save DC:  8 + Constitution Modifier + Proficiency Bonus

 

Blood Pool

Starting at level 3, your Blood Pool is a pool of hit points that fills as you take damage. Whenever you take damage from another creature, store the hit points lost in your Blood Pool. When you use a Blood Art, you may substitute some or all of the Hit Point Cost from the pool of hit points in your Blood Pool. At the end of your turn, the Blood Pool empties, reducing itself down to zero. Your Blood Pool cannot contain more than 10 times your fighter level hit points at any given time.

Bloodletting

Starting at level 7, your ability to manipulate your enemy’s blood grows. Once per turn, when you damage a creature with an attack, you may choose one of the following options:

Vampiric Strike: You may spend any amount of Hit Points from your Blood Pool (up to the amount of damage dealt by the attack) to heal for the amount spent.

Pooling Strike: Your Blood Pool fills with an amount of Hit Points equal to the amount of damage dealt by the attack.

The Proper Tools

Starting at level 10, whenever you finish a Long Rest, you may bond with one magical weapon in your possession. Until you take a Long Rest, your Blood Art Save DC is increased by the weapon's enhancement bonus. If you do not bond to a weapon, you instead increase your Blood Art Save DC by 1 until you take a Long Rest.

Additionally, you gain proficiency in Medicine.

Exaltation

Starting at level 15, you begin to truly relish in the art of manipulating blood. At any point during your turn, if the amount of Hit Points in your Blood Pool is above 33% of it’s maximum value (rounded up), you may enter a state of Exaltation until the end of your turn.

Exalted: Until the end of your turn, the range to land a critical strike on damaged creatures increases by one.

Bloodless Exaltation: The loss of your own blood can drive you into a delirious, blood-frenzied state. When your Hit Points drop below 33% of your maximum hit points (rounded down), you become Exalted until the end of your next turn. You can only become Exalted this way once per Short Rest.

Optional Rule- Multiclassing: If you have levels in another class, your critical strike range when Exalted is set to 19-20 against damaged creatures instead of increasing by one.

Blood Rush

Starting at level 18, constantly losing and regaining the blood in your veins has sped up your attacks and speed. Whenever you score a critical hit on a damaged target, or kill a creature, you gain the effects of the Haste spell until the end of your next turn, not requiring concentration.

Blood Arts

The Blood Arts are presented here in alphabetical order:

Blood Doping (Cost: 15% Max Hit Points)

As a Bonus Action, increase the walking speed of a creature within 30 feet of you by 10 feet until the end of their next turn. (Increase this amount to 20 at level 5, 30 at level 10, and 40 at level 15.)

Blood Shield (Cost: 10% Max Hit Points)

When you land an attack on a damaged creature, you can use your control over blood to create Bloody Droplets that circle around you, attempting to disrupt blows from hitting you. You gain +1 AC until the start of your next turn. (Increases to +2 AC at level 7, +3 at level 10, and +4 at level 15.)

Blood Transfer (Cost: 15% Max Hit Points)

When you land an attack on a creature, you may allow one creature within 5 ft. of it (other than yourself) to spend one of their hit dice to heal, as if it was spent during a Short Rest.

Bloodseeker Weapon (Cost: 20% Max Hit Points)

When you take the attack action on your turn, you may coat your weapons with your blood. Until the end of your turn, you may add your Constitution Modifier to your attack rolls against any Bloodied Creature.

Coagulopathy (Cost: 25% Max Hit Points)

When you land an attack on a creature, you can force their body to stop regulating it’s own repair. Until the start of your next turn, the creature cannot regain hit points.

Crimson Martyr (Cost: Variable)

As a reaction, when a creature within 60 ft. of you would take damage, you may spend Hit Points up to half of the amount of damage they would take. The damage they take is reduced by the amount of hit points spent.

Emergency Coagulation (Cost: 5% Max Hit Points)

As a reaction, when a creature within 30 ft. of you fails a Death Saving Throw, you can change the failure to a success.

Endorphin Rush (Cost: 10% Max Hit Points)

As a reaction, when you or another creature within 30 ft. of you makes an Acrobatics or Athletics check, you may add your Constitution Modifier to the ability check.

Hypertension (Cost: 25% Max Hit Points)

You attempt to force the flow of blood in a creature's veins to flow at a dangerous rate, putting strain on their heart. As an action, force a creature you can see within 30 ft. of you to make a Constitution Saving Throw. On a failure, they start to suffer various symptoms of Hypertension – at the start of each of it’s turns for the next minute, the creature must choose whether it gets a move, an action, or a bonus action; it gets only one of the three. You must concentrate on this effect like a spell for it to stay in effect. Cannot be used on creatures that do not have blood.

Hypotension (Cost: 25% Max Hit Points)

You attempt to slow the flow of blood in a creature’s veins, causing it to become sluggish. As a bonus action, force a creature you can see within 30 ft. of you to make a Constitution Saving Throw. On a failure, they become sluggish - for the next minute, they subtract half of your proficiency bonus (rounded down) from all attacks and ability checks they perform. You must concentrate on this effect like a spell for it to stay in effect. Cannot be used on creatures that do not have blood.

Marionette (Cost: 20% Max Hit Points)

When you take the attack action on your turn, you may forgo one of your attacks to instead allow another willing ally within 30 ft. to make a melee weapon attack with disadvantage. The willing creature may use their reaction to remove disadvantage from the attack.

Migraine (Cost: 30% Max Hit Points)

When you land an attack on a creature, you may inflict them with a migraine. Until the end of their next turn, if try to cast a spell, they must make a Constitution Saving Throw. On a failed save, the spell dissipates with no effect, and the action, Bonus Action or Reaction used to cast is wasted. If the spell was cast with a spell slot, the slot isn’t expended. Cannot be used on creatures without blood.

Muscle Spasticity (Cost: 10% Max Hit Points)

When you land an attack on a creature, you can force their muscles to spasm. Until the end of their next turn, their movement speed is halved.

Vampiric Blood (Cost: 40% Max Hit Points)

As a Bonus Action, you fully take on the aspects of a vampire. Until the end of your next turn, your creature type becomes Undead. Whenever you hit a creature with an attack, you regain hit points equal to your proficiency bonus. You gain 120 ft. of darkvision, however you have disadvantage on attack rolls made in direct sunlight. If you end your turn in direct sunlight, you suffer 20 points of Radiant Damage and are frightened until this effect ends.