Coulrokin are adaptable, pick an ability score to increase by 1, and another by 2.

Coulrokin reach adulthood by 18, and live for around 150 years.

Coulrokin vary widely in height and build, from under 4 feet to well over 7 feet tall. Your size is medium or small.

Your base walking speed is 30 feet.

You can speak, read, and write Common and Deep Speech.

Your creature type is abberation.

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.

While conscious, you cannot be knocked prone against your will.

You have resistance to bludgeoning damage.

For a total of 1 minute per short rest, you can Stretch or Squish yourself as a bonus action. This transformation can be ended at will. You and anything you are wearing or wielding physically change in size.

Stretch
Your size increases by one size category, and you gain advantage on intimidation and athletics checks, and disadvantage on acrobatics and stealth checks.

Squish
Your size decreases by one size category, and you gain advantage on acrobatics and stealth checks, and disadvantage on intimidation and athletics checks.