Path of the Bloodseeker

Much like a moth to a flame or a wolf to a hunt, as a barbarian sets down the Path of the Bloodseeker they become obsessively drawn to blood, seeking to shed it from their enemies. Many on this path seek to mark themselves with the blood of their kills, some saving it in vials, other imbuing their weapons with its crimson touch

Double-Edge

Starting at 3 level, you can imbue the strength of your blows with your own blood. While you are raging, when you make a melee attack, but before you roll to hit, you can choose to take damage equal to 1d4 X your barbarian level. Doing so turns a successful hit into a critical hit, and ignores all resistances and immunities for that strike. You can make this attack a number of times equal to 1 + your Constitution modifier. You regain all uses of this feature at the end of a short or long rest.

First Blood

As your proficiency at drawing blood from your enemies grows, so does the damage you can do to them. When you reach 6 level, you gain the ability to rend the flesh of each creature you hit. The first time you hit a creature with a melee attack; they must succeed a constitution saving throw (DC = 8 + proficiency bonus + Strength mod) or start bleeding. On a failed save the affected creature takes 1d6 damage at the start of their turns, and have disadvantage on constitution saving throws. Affected creatures can attempt to succeed the saving throw at the end of their turns. On a success, the creature cannot be affected by this effect for 1 hour.

At level 11, the damage becomes 1d8, at 17 level it becomes 1d10.

Creatures without blood are immune to this effect.

Seeing Red

Starting at 10 level, you gain advantage on Wisdom (Perception) and Intelligence (Investigation) checks regarding tracking creatures with blood. Double your proficiency modifier if the creature(s) you are tracking is one you have wounded in the last 24 hours. Additionally after you strike a creature with a melee attack, they cannot be hidden from you until the end of your next turn, provided they remain on the same plane of existence and are within 30 feet of you.

Bloodbath

Starting at 14 level, during your rage you can spend an action to attack a number of times equal to 1 + your Strength modifier, or until you miss. Either way, at the end of the flurry you are stunned until the end of your next turn, if it ends because of a missed attack, your rage also ends regardless of Persistent Rage.