Siren Sorcery

Many think of Sirens as the monstrous temptresses of the sea. While this is certainly the case in the modern era; before written history in the dawn of civilization, they were witches of incredible power over the oceans. A single Siren could turn fate against the strongest naval force. Ambition turned the early Sirens towards trying to capture the power of mortal minds, leading to their transformation into horrifying creatures and, ultimately, their downfall. Those that refused to follow that path have managed to preserve their true legacy in their daughters and sons. Songs can captivate; but they should be used to reach hearts, not control them.

Song of the Tide

The arcane magic you command is infused with elemental water. You can speak, read, and write Aquan. Furthermore, you feel the rhythm of the ocean tides in your veins. You gain proficiency in the Performance skill if you don't have it already. You also gain advantage on any Performance skill check if you are within 100ft a large body of water.

Aquatic Form

Starting at 1st level, you can assume a form the ocean will embrace.

As a bonus action, you can use the spell Alter Self when in contact with water, and you can breathe underwater. This is not considered a spell you know.

Song of the Waves

At 6th level, your voice causes foes to be crashed by waves of ally attacks. 

As an action, you sing a song gives advantage on all attack rolls to all allies that can hear you until the start of your next turn. This action can be used once per short rest. At 12th level, the number of uses increases to 2.

Aquatic Guide

You have unparalleled knowledge of the sea and gain the ability to navigate the ocean with ease. You  cannot become lost at sea except by magical means, and you can predict the weather while over a body of water for the next 72 hours.

Song of the Deep

Starting at 14th level, when you are hit by a melee attack, you can use your reaction to deal cold damage to the attacker as they are hit with a lash of icy deep ocean water. The damage equals your sorcerer level. The attacker must also make a Strength saving throw against your sorcerer spell save DC. On a failed save, the attacker is pushed in a straight line up to 20 feet away from you.

Song of the Living Reef

As an action, you crest a massive wave infused with the life energy of water. All allies within 100 ft., including yourself, are cured of any conditions or curses. You also can divide up a pool of 125 hit points among yourselves up to respective maximum hit points. You may do this once per long rest.