Curse of the Panther's Black Blood

You have been blessed with the Black Blood of Malar. Your Strength score becomes 17. You gain immunity to bludgeoning, piercing, and slashing from nonmagical attacks not made with silvered weapons. Additionally, your natural weapon attacks add your Strength modifier. Your Bite attack is (1d10 + Str) and your Claw attack is (1d8 + Str). When under a full moon you must make a DC 17 Wisdom saving throw or transform into your hybrid form. You also gain the following traits
Shapechanger. You can use your action to polymorph into a panther-humanoid hybrid or into a panther, or back into your true form, which is humanoid. Your statistics, other than size, are the same in each form. Any equipment you are wearing or carrying isn't transformed. If you die you revert to your true form.
Keen Hearing and Smell. You have advantage on Wisdom (perception) checks that rely on hearing or smell. 
Pounce (Panther or Hybrid Form Only). If you move at least 15 feet straight toward a creature and then hit it with a claw attack on the same turn, that target must succeed on a Strength saving throw., or be knocked prone. The DC is equal to 8 + your proficiency bonus + Strength modifier. If the target is prone, you can make one bite attack against it as a bonus action.  
Black Blood Emergence. When you roll a natural 1 on a check, attack roll, or saving throw you must make a DC 17 Wisdom saving throw. On a failure you transform.