Base Class: Barbarian
Your enemies suffer from wounds greater than they have ever experienced, and you thrive off of the knowledge that their death is fast approaching. Whilst raging, your attacks inflict bonus wounding damage a lasting effect, you gain temporary health equal to the damage dealt. Enemies must make a constitution saving throw, subsequently, at the start of their turn they can make another saving throw which will end the effect.
Wounding
Starting at 3rd level, while raging you can chose to inflict debilitating damage to your foe. When you use this ability your next attack will deal an additional 1d6 wounding damage, and the enemy must make a constitution saving throw, (Save DC = 8 + your constitution + your proficiency bonus.) On a failure, the enemy takes 1d4 bleed damage, and continues to do so at the start of each turn for one minute. At the end of the enemy's turn, they must make another constitution saving throw, if the enemy succeeds, then the effect ends immediately. This damage increases at higher levels, as specified below. The bleed affect does not stack with itself.
Adrenaline
Also at 3rd level, whilst an enemy is bleeding within 30ft due to Wounding you gain temporary hit points equal to the bleed damage deal
Deep Wounds
Starting at 6th level, you can now add your constitution modifier to the damage dealt by the bleeding afflicted by Wounding an enemy, the temporary hit points granted by Adrenaline also benefit from this.
The damage dealt by Wounding becomes an initial 1d8, and the damage dealt by bleed is now 1d6.
Bloodthirsty
Starting at 10th level, whilst under maximum hit points, the temporary health granted by Adrenaline will instead heal you.
The damage dealt by Wounding becomes an initial 1d12, and the damage dealt by bleed is now 1d8.
Rampage
Starting at 14th level, once per short rest, you are able to leap a number of feet equal to half of your remaining movement speed into an unoccupied space, and deal 3d10, to any enemies within 10ft. The total damage dealt buy this ability is gained as temporary hit points, the hit points gained in this way do not benefit from any damage resistances.