There is an idea that the only way to handle monsters that run rampant is to become a monster yourself. You specialize in taking down monsters while your body is gradually mutating, acquiring the traits of the very things they’ve hunted. Unlike lycanthropy, this process remains as an anomaly with the most known about it being that it is fueled on emotions. Those who walk this path may be seen as monsters. Some are mere cryptids. But few are labeled as heroes. No matter what though, all members of this kin share one goal: kill all monsters.

Level 3: Doomed Slayer

3rd-level Path of the Monster feature

You begin to acquire common traits found from various invasive monsters that roam this plane. When you activate your Rage, your creature type is changed to a Monstrosity and you gain one of the following options of your choice.

Construct

You gain a bonus to your AC equal to your Proficiency Bonus and you can subtract 10 feet from effects that would forcefully move you.

Ooze

You don’t need a free hand to Grapple a target and targets Grappled by you are instead considered Restrained.

Plant

You create Difficult Terrain for any target of your choice within 20 feet of you and are pulled 10 feet towards you at the start of their turns while within the area.

Monster Hunter

3rd-level Path of the Monster feature

You have a knack for searching for monsters that may be in your general vicinity lurking. You gain proficiency in one of the following skills of your choice: Arcana, Nature, Perception, or Survival. You have Expertise on ability checks made with the skill you chose.

Level 6: Steeled Guts

6th-level Path of the Monster feature

When your mind undergoes immense stress from experiencing monsters you have faced, you can steel your nerves and bear it. You gain a bonus to your Intelligence, Wisdom, or Charisma saving throw equal to your Constitution modifier.

Level 10: Feral Hunger

10th-level Path of the Monster feature

Your mutation begins to grow and you develop an eerie shift in your psyche that makes you inclined to behave like the monsters you hunt. When you activate your Rage, you can select an additional monster type and gain its following feature.

Aberration

You gain Immunity to Psychic damage and gain 15 feet of Truesight.

Fey

You have Immunity to being Charmed, Frightened, and Magical Sleep.

Fiend

You have Immunity to Fire damage and being Poisoned.

Level 14: Tarnished Warrior

14th-level Path of the Monster feature

By becoming an expert at monster hunting, you have been transformed into something else. You gain the following features.

Find Monster. You instantly become aware of Aberrations, Celestials, Constructs, Elementals, Fey, Fiends, Oozes, Plants, and Undead within 500 feet of you. You also know the exact location of the creature and its Alignment as long as it remains within the range of you.

Monster Trait. When you activate your Rage, you can select an additional monster type and gain its following feature.

Celestial

You deal bonus Radiant damage equal to your Proficiency Bonus when you hit a creature with a melee attack while you emit a 30 foot Emanation of bright sunlight and Dim Light for an additional 15 feet.

Elemental

Creatures of your choice that start or move for the first time within 10 feet of you take either Fire, Cold, Thunder, or Bludgeoning damage equal to half your Barbarian level (round down).

Undead

You gain a Fly speed equal to your Walking speed and become Invisible at the end of each of your turns until you move or make an attack roll.