Lycanthropy (Wereshark)

You have been afflicted with the curse of Lycanthropy and your body has undergone dramatic changes, some under your control, others not so much

Damage Immunity

You have developed immunity to Bludgeoning, Piercing and Slashing damage from non magical sources that aren't silvered

Shapechanger 

You can use your action to Polymorph into a Shark-humanoid Hybrid or into a large Shark, or back into your true form, which is humanoid. Your statistics other than your AC (which changes to 12) are the same in each form. Any equipment you are wearing or carrying isn't transformed and will either fall or break upon transformation. You revert to your true form when you die.

Blood Frenzy (Shark and Hybrid Form Only)

You have advantage on melee attack rolls against any creature that doesn't have all of its hit points

Natural Formed Weapons

You have developed natural weapons in the form of a deadly bite due to your Lycanthropy

Water Breathing (Shark Form)

You can only breath underwater