Ravenous Hunger

You possess an insatiable hunger for sapient flesh, the taste of succulent fat and the feel of coppery blood on your tongue. You rely on this as your sole means of existence. Being deprived of it for too long will cause burgeoning insanity, that, if you do not consume others, will consume you. You are an animal, an inhumane being.

Insanity

Your monstrous hunger drives you insane with its desire to be sated by flesh. It is measured in levels that affect you worse and worse. You must consume a creature every 10 minutes to keep from increasing a level. This insanity is shown below.

Level              Effect

1.  At the sight of gore and violence, you laugh madly and you always speak about yourself in the third person.
2. You tear out your hair and scream intermittently.
3. You become unable to discern allies from enemies and attack any living thing within 15 feet.
4. You eat yourself and die.

Devour

You gain the ability to devour foes, while they are desperately fending you off or while delicious blood running off their motionless corpse soaks into the ground. As an action, you can sink your teeth into the opponent's flesh, dealing 10d6 piercing damage if they are alive. If this does not kill them, they will begin to bleed, losing 8d6 health every round. This will temporarily recharge your insanity levels by one, as well as giving you 5d4 hit points.

Feeding Frenzy

Once per short or long rest you can enter a feeding frenzy as a free action. This lasts until all sapient and sentient beings are dead within 100ft of you, allies and enemies. during this period you gain the following features

• You gain advantage on all attacks.
• Attacks by you deal double damage.
• You gain advantage on acrobatics and athletics checks.
• People neutral to you or worse are treated as your mortal enemies. Those with a good relationship with you are simply ignored. 
• Your insanity level increases by one.

Savage Predator

At the 11th level, you gain one of the following beastly features of your choice.

Beastly Agility

You gain an extra 10 feet of walking speed.

Beastly Endurance

You gain +5 to your armour class.

Death Throes

When you are below 30 hit points your insanity increases by 1 level and you gain the following features:

• Your attacks automatically succeed.
• Your movement speed increases by 20 feet.
• You gain resistance to all damage types.
• You emit a fear radius of 30 feet.