When you enter a Rage you have advantage against Critical hits and you gain an extra attack

Your Constitution increases by 1 and one other stat by 2

Beastial skeletons gets an extra appendage, weather it's a tail or an arm, It can lift and carry stuff from up too 80 pounds and it can hold weapons and items for you too use

You can deal damage with Your claws found 1d6 +strength modifier 

You have taken many bones from other beasts and have added them to yourself giving you long limbs that Reach up to 10ft

You are made from bones and are immune to Disease and Poison. Also you do not need to Eat or drink, Aditionally you enter a meditative trance that counts as a long rest and lasts 4 hours with the short rest lasting 2 hours.