While you have one quarter of your hit points (rounded down) or fewer, you deal an extra 4 (1d6) damage to any target you hit with a melee attack. 

Your developing claws are natural weapons. Your unarmed attacks deal 1d4 + your Strength modifier slashing damage, instead of the normal bludgeoning damage. 

You are proficient in the Athletics skill. 

You can cast mage hand at will (the hand is invisible). Starting at 3rd level, you can cast the feather fall spell once per long rest. Starting at 5th level, you can cast the mirror image spell once per long rest. Your spellcasting modifier for these spells is Wisdom. 

Your Constitution score increases by 2, and your Strength score increases by 1.

Quaggoths mature at the same rate as humans, but they’re considered young until they reach the age of 30. On average, they live about 210 years.

Most quaggoths are chaotic, with a preference towards a lack of government and written rules. They tend toward neutral as well, with a strong sense of survival of the fittest. Rising quaggoths disapprove of taking sides other than their own.  

Quaggoths (when standing upright) stand between 5 and 6 feet tall and average about 200 pounds. Your size is Medium.

Your base walking speed is 30 feet and you have a climbing speed of 30 feet.  

Accustomed to life underground, you have superior vision in dark and dim conditions. You can see in dim light within 60 feet of you as if it were bright light, and in darkness as if it were dim light. You can’t discern color in darkness, only shades of gray.

You have advantage on saving throws against poison, and you have resistance against poison damage (explained in the “Combat” section).

You can speak, read, and write Common and Undercommon.