You can see in dim light within 60 ft. as if it were bright light, and in darkness as if it were dim light (only shades of gray)

You can increase two ability scores one +2 the other one by +1

You can attack with your claws and Jaw

You can choose to multi-attack with your claws and Bite

you can choose to gain different limbs which grant you certain benefits

since you are a demon you can get up to 800 years old and the languages you can speak are Abyssal and Common.
You also have resistance to fire and poisen dmg and are Immune to poisened condition.
You have advantage saving throws against  to being charmed to.