Bloodrunner

Your power comes from your life force and the blood in your veins.  Technically speaking, all blood has magical qualities, but those who are able to tap its potential are few and far between.  Every mortal being is born with a certain potency of magic in their veins.  Most have almost no magic, and either gain magical abilities through other means or live to lead mundane lives.  Those born with potent magical blood usually find that blood toxic to them, overwhelming and killing them in infancy.  Only one in a million has blood that is significantly powerful without being fatal. Most people have never even heard of the true rituals the Bloodrunners perform.  Many of those who have see the act of drawing blood to cast magic as something twisted and perverse, often mistaking the practice as a fiendish ritual. Some beings see this power as a gift, granting them potent magical abilities.  Others view it as a curse, subjecting them to side glances and ridicule.  Regardless of your opinion, your unique blood grants you abilities unavailable to any other being.

Blood Omen

Beginning at 3rd level, you can tap your blood to gain a magical advantage, using special dice called blood dice.  You have a number of blood dice equal to your constitution modifier.  When you expend a blood die, you extract blood from your body, taking necrotic damage equal to the number rolled.  This damage ignores temporary hit points, resistance, immunity, and vulnerability.  At 3rd level, your blood die is a d4.  It becomes a d6 at 5th level, a d8 at 9th level, a d10 at 13th level, and a d12 at 17th level.  All expended blood dice are regained after a long rest.

Blood Drop Frenzy

Beginning at 3rd level, your blood can be drawn to amplify your harmful Attacks.  Once per turn, when you deal damage, you may expend a blood die and add the roll to the damage of the attack.  The damage dealt with this feature is of the same type as the damage dealt by the amplified weapon.

 

Gift of Blood

At 6th level, you're able to extend your life force to others.  As an action, you may expend a blood die to grant a willing creature within 5 feet temporary hit points equal to the number rolled on the die.

Firghtened of A Little Blood

Forced Transfusion

At 14th level, your familiarity with blood grants you limited control over the life force of others.  When a creature within 5 feet of you takes damage, you may use your reaction to expend a blood die.  The target takes necrotic damage equal to the number rolled, and you regain an equal number of hit points.  The blood die expended by this feature does not cause you to take damage.  Once you use this feature, it cannot be used again until you finish a short or long rest.