Base Class: Barbarian
Once you filled with anger and killing desire, you will follow this path. The path were the strongest one win. And the path were peoples seeking for revenge, when you failed to protect someone, when you failed to Fullfill your's duty.
Level 3: Bloodthirsty Berserker.
If you use attack with weapons, it counts as bonus action and gain additional +(level) damage in rage mode. This can only happens once/turn but then you got one stack of exhausted. But if you choose to use unarmed strike it gives 5 attack/level you have.
Level 6: Avanger Aura
You unleash bloodthristy aura as extra action. Will active until the next turn, when the aura active every hostile creature within 10ft can not attack your allies and the only one who can be attacked is yours. And also when this active everytime you hit a creature you gain additional +5 /3 level damage bonus when in rage mode, but if there are allies beside then your allies must have saving throw on dexterity 12, if fail takes a half of the damage you deal. This can only happens in rage mode, and when you use it, -5 int.
Level 10: retaliatory attack.
When you take damage from a creature that is within 5 feet of you, you can take a Reaction to make one melee attack against that creature, using a weapon or an Unarmed Strike.
Level 14: Indomitable Howl
You Howling with a large decibel sound. You will dominate others enemy and make them stunned for one round if they fail Constitution saving throw 15.