Magnificent Mollusk

Lady Tentavia the Magnificent considers herself the most powerful sorceress aboard the Saltwraith, and she makes sure everyone knows it. When enemies approach, she rises from the water with tentacles spread wide and eyes blazing. She surveys their ranks, identifies their strongest warrior, and obliterates them with a lance of pressurized water so forceful it can punch through ship hulls.

"BEHOLD MY MAGNIFICENCE!" she declares, every single time. The crew doesn't even look up anymore.

How did a cecaelia of such talent end up working for Captain Frankie? The answer involves a treasure map.

The Saltwraith had seized it from a merchant vessel. It was genuine, an honest-to-gods treasure map, with a proper X and everything, promising "wealth beyond measure" in some forgotten cove. Murray the cat insisted they investigate. "We need capital, Captain."

What they found wasn't treasure. It was Tentavia, living in a sunken shrine and guarding an ancient artifact called the Crown of the Abyssal Sovereign, which supposedly granted "ultimate magical dominion over the seas." It was actually just a hat made of coral.

When the crew arrived, she emerged with tentacles flared and water swirling around her. "BEHOLD! I am Lady Tentavia, Guardian of the Crown, Protector of—"

"You're joining my crew," Captain Frankie said.

"What? No! I am a guardian! I—"

"I'll pay you."

Tentavia paused. "How much?"

"Standard share plus meals."

"...I'm listening."

And that's how the Saltwraith acquired a powerful water mage who was wasting her talents guarding a coral hat in the middle of nowhere. Now she bisects armored warriors with pressurized water lances, delivering overwhelming aquatic violence with maximum drama.

"WITNESS MY SUPREMACY!" she shouts, firing another blast.

A powerful sorceress employed by a dog, struggling to maintain her dignity while serving on a pirate ship. It's not the destiny she imagined, but the pay is good.