Sea Demon (Merfolk-only Feat)

The need to rid the oceans of landers has driven you to embrace a monstrous transformation, hardening your scales into a weapon-resistant, tide-forged form. You gain the following benefits.

Ability Score Increase. Increase your Strength or Constitution score by 1, to a maximum of 20.

Verdant Surge. Once per short or long rest, you can use an action to enter your Sea Demon transformation for 1 minute. Your flesh turns a sickly yellow-green, like rotting seaweed, your scales thicken while retaining their natural color, and your eyes turn bloodred. Your voice becomes distorted and unnatural, carrying a harsh, hollow resonance.

While transformed, you have advantage on Charisma (Intimidation) checks and disadvantage on Charisma (Persuasion) checks. You cannot cast spells or use features that would cause a creature to become Charmed while in this form.

Hardened Scales. For the duration of Verdant Surge, bludgeoning, piercing, and slashing damage you take from attacks is reduced by an amount equal to your proficiency bonus. In addition, once on each of your turns when you hit with a Tail attack, you deal extra damage equal to your proficiency bonus.