Base Class: Barbarian
You are an master of returning pain to the enemies that harm you. When you take damage, you channel it into a blood rage and woe to those enemies near you as your force of fury punishes them.
Blood Rage
When you take damage, you may choose to take an extra 1d6 necrotic damage from the hit. If you do, you go into a blood rage and may add this damage to your first hit until your rage ends then you gain a level of exhaustion. The number of blood rage dice increases by one when you reach 8th to 2d6 and 13th level for a total of 3d6 additional necrotic damage.
Ring of Pain
You know how to bring the hurt down on all who would enter your reach. When an opponent hits you with a melee weapon attack within 5 feet of you while you are in a Blood Rage, they take necrotic damage equal to half your active Blood Rage Dice.
Devour Flesh
Blood is life for the Reaver. When you hit with an attack, you can chose to gain life equal to the damage dealt by your Blood Rage dice on the attack. You can use this feature a number of times equal to your Constitution modifier every long rest.
Monstrous Rampage
You have found the secret of manipulating the blood that boils inside you, allowing you to enter a state of Blood Rage that increases your deadliness immensely. You can chose to enter a Monstrous Rampagefor one minute when you enter a Blood Rage. You gain the effects of the Haste spell for the duration and roll double your Blood Rage dice. When your Blood Rage ends, you suffer an additional point of exhaustion and can't use this feature again until you finish a long rest.