Taste my salty home brew

[Akratus]

https://homebrewery.naturalcrit.com/share/ByNptN3sr

It's a totem of the shark for the Barbarian.

3rd Level
You gain the bloody bite of a shark. While raging you may bite as a bonus action. This deals 1d4 piercing damage plus strength modifier and can be used as an opportunity attack. The damage die increases as you level:

Level - Damage
3 - 1d4
6 - 1d6
8 - 1d8
10 - 1d10
12 - 1d12
14 - 2d12
16 - 3d12
18 - 4d12
20 - 5d12​

The spirit of the shark allows you to rend and tear with your teeth as well as your weapon.

6th Level
You gain the ability to sense and hunt prey like a shark. You gain a swimming speed equal to your regular speed and can smell fresh blood on land from 120 feet and twice as far underwater. The spirit of the shark makes you a ferocious hunter.

14th Level
The strength of your teeth rival those of the strongest sharks in the oceans. When making a succesful attack while raging, you reduce the target's movement speed to zero for one turn and the next attack they make against you has disadvantage. Additionally, you gain blindsight at a range of 10 feet for sensing creatures. Even your skin now functions like that of a shark, picking up natural electrical stimuli around you allowing you to sense creatures.

This shit is fun, balanced and cool as fuck. Change my mind.
For real though I am desperate for feedback.