Path of the Serpent

Perhaps you learned this raised in a yuan-ti cult.

Rattler

3rd level while you are not raging you have advantage on intimidation checks against creatures that can hear you.

Counterfang

When you are struck by a melee attack while you are raging, you may use your reaction to retaliate quickly with sharp, poisonous stings. The attacker takes poison damage equal to twice your constitution modifier. 

Cobra Hood

As an action you flex your body in an unsettling manner. Make a charisma (initimidation) check. One creature within 30ft of you must make a save vs your intimidation roll or be frightened of you for one minute. (Save ends end of turn).

You can use this ability a number of times equal to your proficiency bonus between long or short rests. 

If the creature succeeds on its saving throw, you can’t use this feature on that creature again for 24 hours.

Coiling Body

Beginning at 6th level you gain a climb speed equal to half your move speed and have advantage on athletics checks to avoid falling or being dislodged. 

Venom in the Veins

You gain resistance to poison damage. 

As a bonus action you may strike yourself with your own melee weapon. Roll the weapon's damage die. You take slashing damage (this damage can be reduced by resistance i.e. from raging) equal to the roll as you coat your weapon in your own venomous blood. For unarmed strikes you take 1 damage.

For one minute the coated weapon deals bonus poison damage equal to the die roll plus your constitution modifier. 

Shedding Skin

Once per long rest when you roll hit dice as part of a short rest to recover hit points you can take the maximum result instead of the die roll. 

 

Neurotoxic Poison

Starting at 10th level when a creature takes poison damage from one of your Path of the Serpent abilities you may force them to make a constitution saving throw (DC 8 + Con Mod + Proficiency bonus) or be paralyzed for one minute. (Save ends at end of turn).

 

You can use this ability a number of times equal to your proficiency bonus per long rest. 

Hypertoxic

You now only take 1 damage when coating your weapons in your own venom. Roll the weapon's damage die twice to determine how much poison damage attacks deal. 

Flexible Body

While raging you gain an additional 5ft of reach for your melee attacks.

When making athletics or acrobatics checks as part of a grapple, add your constitution modifier. 

Cold-blooded

While not raging you are immune to being charmed or frightened and are proficient in intelligence saves.