Trials of the waves

You've spent countless moons training under a waterfall 100x stronger then normal you've swam against waves 5x your size you've gone against rip currents 70x stronger swimming against it

Expanded mind

 

If you see a sea creature You roll a dexterity action if it is above 6 its successful and you gain the knowledge of the sea creature if it is 6 or below it fails and you may not know the creature 

Wrath of the tidle gods

If your hp is down to half or lower you become a spirit of pure water all of your teammates are healed to max hp and you are immune to all attacks and if your hp is zero same thing happens 

Call of the water serpents

Starting at 6th level, you can call on your patron to alter fate in your favor. When you make an ability check or a saving throw you can call upon a serpent of the waves 

Waves of resistance

Starting at 10th level, you can choose three damage type. You gain resistance to that damage type until you choose a different ones. 

Abyssal zone

Starting at 14th level, when you hit a creature with an attack, you can use this feature to instantly transport the target through underwater. The creature disappears and hurtles to the deepest pit underwater 

Once you use this feature, you can’t use it again until you finish a long rest.