Your fanged bite is a natural weapon, which counts as a simple melee weapon with which you are proficient. You add your Constitution modifier, instead of your Strength modifier, to the attack and damage rolls when you attack with this bite. It deals 1d4 piercing damage on a hit. While you are missing half or more of your hit points, you have advantage on attack rolls you make with this bite. When you attack with this bite and hit a creature that isnt a Construct or an Undead, you can empower yourself in one of the following ways of your choice: You regain hit points equal to the piercing damage dealt by the bite. You gain a bonus to the next ability check or attack roll you make, the bonus equals the piercing damage dealt by the bite. You can empower yourself with this bite a number of times equal to your proficiency bonus, and you regain all expended uses when you finish a long rest.
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 discern colors in that darkness as shades of gray.
You don't need to breathe.
You have a climbing speed equal to your walking speed. In addition, at 3rd level, you can move up, down, and across vertical surfaces and upside down along ceilings, while leaving your hands free.