Your Strength score increases by 2, and your Constitution score increases by 1.

You can breathe both air and water. Additionally, you have a swimming speed of 30 feet.

In humanoid form, Razorfin Shifters appear to be strong, muscular sea elves with dark eyes and prominent teeth. Your size is Medium in your humanoid and hybrid forms, but may be Medium or Large in your shark forms.

You have blindsight to a range of 30 ft. underwater (10 ft. on land). You lose this ability until the end of your next round whenever you take lightning damage. You may not detect undead creatures or constructs with this ability. 

You have proficiency in the Perception skill.

Razorfins possess the ability to assume two alternate forms—the hybrid shark and the reef shark. As a bonus action, you may change into either your hybrid form or your shark form. You may remain in this form 1 hour, reverting to your humanoid form when the time expires, you go unconscious, you drop to 0 hit points, or you die. You may revert to your humanoid form as a bonus action. Once you use this ability, you may not use it again until you take a short or long rest.

• Hybrid Form. In your hybrid form you grow sharp teeth and take on a more intimidating shark-like appearance. This hybrid form may use weapons, wear armor, and carry equipment normally. Your unarmed strikes deal 1d6 piercing damage. In addition, you gain advantage on Charisma (Intimidation) checks, and Wisdom (Perception) checks that rely on smell. You gain disadvantage on Intelligence checks and all other Charisma checks.
• Shark Form. You may assume the form of a reef (tiger) shark as if using the druid’s wild shape class feature. Unlike the druid’s wild shape feature, your hit points remain the same between forms and your physical ability scores in shark form cannot be lower than your humanoid form’s physical ability scores due to this feature.

As a bonus action, you can mark one creature you can see within 10 feet of you. Until the end of your next long rest, your proficiency bonus is doubled for any ability check you make to find the marked creature, and you always know the location of that creature if it is within 60 feet of you. You can't use this trait again until you finish a short or long rest.