Around hearthfires of yore, elders would recount the grim saga of the Red Death. They spoke of how in clash of steel and spray of life's essence, these battle‐mad souls unlocked a hellish rage to match any foeman. The more their veins spilled rubies or their flesh tore open, further the madness careened them into slaughter's embrace. Any since who tasted such scarlet‐soaked strife and crawled thence were doomed to stalk the killing fields again, for only under blazing skies awash with butchery could the howls in their hearts be lulled asleep.
Starting at 3rd level, when you kill a creature while raging, you gain a stack of Bloodlust, up to a maximum of 3. Each stack gives you an additional +1 to melee attack and damage rolls while raging. Bloodlust stacks reset whenever your rage ends.
Starting at 3rd level, You can detect the scent of blood acutely. You have advantage on checks to percieve, find, or track blood or bleeding creatures.
Starting at 6th level, whenever you take piercing or slashing damage while raging, you gain Rage HP equal to the damage taken.
Starting at 10th level, you can spend a stack of Bloodlust to make one melee weapon attack as a bonus action.
Starting at 14th level, when you are reduced to 0 HP while raging, you can make a DC 10 Constitution save to drop to 1 HP instead, and immediately gain a stack of Bloodlust.
You can use this feature a number of times equal to your proficiency bonus per long rest. You regain all uses after finishing a long rest.