Sharkkin

Bestial Instincts. Channeling the beast within, you gain proficiency in one of the following skills of your choice: Acrobatics, Athletics, Intimidation, or Survival.   Sea Beast. You have a swim speed equal to your walking speed and you can breathe underwater normally.   Darkvision. You have Darkvision with a range of 60 feet.   Shifting. As a Bonus Action, you can shape-shift to assume a more bestial appearance. This transformation lasts for 1 minute or until you revert to your normal appearance as a Bonus Action. When you shift, you gain Temporary Hit Points equal to 2 times your Proficiency Bonus. You can shift a number of times equal to your Proficiency Bonus, and you regain all expended uses when you finish a Long Rest.   Whenever you shift, you gain the benefit of:   Shark-teeth. When you shift and as a Bonus Action on your other turns while shifted, you can use the rows of sharp teeth to make an Unarmed Strike. If you hit with this Unarmed Strike and deal damage, you can deal Piercing damage equal to 1d6 plus your Strength modifier, instead of the normal damage of an Unarmed Strike.