Path of the Abomination

Abominations have undergone so much suffering that their bodies have physically changed. They usually have scars and deformities, and are often feared and seen as freaks in society. Inside these barbarians, there is a terrifying power. When they rage, they transform into horrifying beasts that have ferocious abilities. Not all barbarians choose this path willingly, some have just been subjected to enough pain that the transformation happened on its own.

Transformation

When you choose this path at 3rd level, you choose what type of transformation you have undergone and you gain a feature related to it. In addition, whenever you rage, your hit points and hit point maximum both increase. The amount they increases by equals your level + your Constitution modifier. Your hit point maximum returns to normal at the end of your rage, but you keep any hit points regained from this feature. This number consecutively decreases by 3 for each rage after the first, and resets when you take a long rest.

If one of these features requires a creature to make a saving throw, the DC = 8 + your Constitution modifier + your proficiency bonus.

Fiend: You gain resistance to fire damage. whenever you rage, you grow horns, claws, and fangs, which you can use as unarmed strikes and deal 1d6 bludgeoning, piercing, or slashing damage, and when you take the attack action on your turn, you can use a bonus action to shove a creature with your horns.

Monstrosity: You gain resistance to acid damage. Whenever you rage, creatures that damage you while within 5ft must make a Dexterity saving throw or take 1d6 acid damage.

Undead: You gain resistance to necrotic damage, and whenever you rage, the first attack you make on each of your turns deals an additional 1d6 necrotic damage.

Mutation

When you reach 6th level, your body mutates, giving you an ability linked with your transformation type.

Fiend: Your walking speed increases by 10ft, and when you rage, your unarmed strikes are considered magical for the purpose of overcoming resistance and immunity to nonmagical attacks and damage.

Monstrosity: As a bonus action, you can force a creature you can see within 30ft to make a wisdom saving throw or gain disadvantage on attack rolls against any creature other than you until the end of your next turn. If a creature succeeds on this saving throw, they are immune to it's affects for 24 hours.

Undead: Whenever you deal necrotic damage with your Transformation feature, you gain temporary hit point equal to the damage dealt.

Corrosion

At 10th level, the damage dealt by your Transformation feature increases by 1d6.

Devastation

At 14th level, you gain a new feature based on your transformation type.

Fiend: You gain +1 AC. While raging, you gain immunity to fire damage, and your size becomes large.

Monstrosity: Your reach increases by 5ft. While raging, you gain immunity to acid damage, and as a reaction when you take damage, you can make any creatures of your choice within 10ft make a Dexterity saving throw or take 2d6 acid damage.

Undead: Your hit point maximum cannot be reduced. While you are raging, you gain immunity to necrotic damage, and you can reach out and touch one creature within 5ft as a bonus action and force it to make a Constitution saving throw or be poisoned until the end of it's next turn. If a creature saves against this effect, it is immune to it for 24 hours.